Hardin Marine

Seaward O2 Oxygen Sensor Adapter Flange
Your Price:
$99.99

Seaward O2 Oxygen Sensor Adapter Flange

620-38080

Whether you're a tuner seeking to add a popular Air/Fuel ratio gauge or you're entering the world of aftermarket fuel injection we have developed the critical part to make this addition a snap. This billet aluminum anodized wedge is at just the perfect angle to allow re-connection of your original exhaust hose. The kit includes (1) O2 adapter wedge, (2) gaskets, and (2) new front attachment studs. Bolt pattern is 3" x 4.5". Designed to fit the Hardin Marine Seaward Manifolds only.


Seaward O2 Wedge / Gauge Kit

Your Price:
$409.99

Seaward O2 Wedge / Gauge Kit

620-38081 + Option(s)

Seaward O2 Wedge / Gauge Kit

  • Gauge kit includes custom tuned .1 AFR Resolution Bosch LSU 4.9 Sensor, 8ft. wiring harness, 304 stainless steel weld-in bung, mounting hardware, and detailed instructions for installation
  • 0-5v data and serial data outputs for ECU, data acquisition unit, or Laptop tuning
  • User programmable range for Rich/Stoic/Lean conditions
  • Peak recall/memory
  • 10:1 to 20:1 AFR range for gasoline applications
  • 12 and 16 volt compatible, compatible with nearly every street car or race car electrical system
  • User Programmable Warning Function
  • Display data in Lambda or numerical A/F ratio

Whether you're a tuner seeking to add a popular Air/Fuel ratio gauge or you're entering the world of aftermarket fuel injection we have developed the critical part to make this addition a snap. This billet aluminum anodized wedge is at just the perfect angle to allow re-connection of your original exhaust hose. The kit includes (1) O2 adapter wedge, (1) gasket, and (2) new front attachment studs.


Seaward Series "Alpha/Bravo - 3" Taller" Small Block Chevrolet Exhaust System

Starting From:
$2,499.99
This Part has options, please click the button below to order.

Seaward Series "Alpha/Bravo - 3" Taller" Small Block Chevrolet Exhaust System

620-38044 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines up to 350HP 
  • 3" Taller Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Silent choice, captains call, and select sound exhaust diverter system compatible
  • Kit includes all bolts and gaskets needed for installation

Seaward Series "Alpha/Bravo - 6" Taller" Small Block Chevrolet Exhaust System

Starting From:
$3,499.99
This Part has options, please click the button below to order.

Seaward Series "Alpha/Bravo - 6" Taller" Small Block Chevrolet Exhaust System

620-38109 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines up to 350HP 
  • 6" Taller Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Silent choice, captains call, and select sound exhaust diverter system compatible
  • Kit includes all bolts and gaskets needed for installation

Seaward Series "Alpha/Bravo HP Magnum" Small Block Chevrolet Exhaust System

Starting From:
$3,499.99
This Part has options, please click the button below to order.

Seaward Series "Alpha/Bravo HP Magnum" Small Block Chevrolet Exhaust System

620-38049 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines up to 450HP 
  • Magnum HP 500 Style Riser for performance applications
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Kit includes all bolts and gaskets needed for installation

Seaward Series "Alpha/Bravo HP" LS Chevrolet Exhaust System

Starting From:
$3,599.95
This Part has options, please click the button below to order.

Seaward Series "Alpha/Bravo HP" LS Chevrolet Exhaust System

620-38153 + Option(s)

  • Manifolds are powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines 4.8 to 6.2L up to 500HP (Camshaft duration not to exceed 234 degrees @.050 Duration) 
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Cast Aluminum Heat treated tubular tuned runner header style internal manifold core for header like performance 
  • Drawformed Non-porous manifold shells are powder-coated for corrosion protection
  • Silent choice, captains call, and select sound exhaust diverter system compatible
  • High Performance Risers include O2 Sensor bungs and plugs.
  • Kit includes all bolts and gaskets needed for installation

Seaward Series "Alpha/Bravo Low Exit" LS Chevrolet Exhaust System

Starting From:
$3,499.99
This Part has options, please click the button below to order.

Seaward Series "Alpha/Bravo Low Exit" LS Chevrolet Exhaust System

620-38155 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines 4.8 to 6.2L up to 400HP (Camshaft duration not to exceed 218 degrees @.050 Duration) 
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Cast Aluminum Heat treated tubular tuned runner header style internal manifold core for header like performance 
  • Drawformed Non-porous manifold shells are powder-coated for corrosion protection
  • Silent choice, captains call, and select sound exhaust diverter system compatible
  • Low Exit Risers include O2 Sensor bungs and plugs.
  • Kit includes all bolts and gaskets needed for installation

Seaward Series "Alpha/Bravo XL" LS Chevrolet Exhaust System

Starting From:
$2,399.99
This Part has options, please click the button below to order.

Seaward Series "Alpha/Bravo XL" LS Chevrolet Exhaust System

620-38156 + Option(s)

  • Manifolds are powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines 4.8 to 6.2L up to 435HP (Camshaft duration not to exceed 228 degrees @.050 Duration) 
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Cast Aluminum Heat treated tubular tuned runner header style internal manifold core for header like performance 
  • Drawformed Non-porous manifold shells are powder-coated for corrosion protection
  • Silent choice, captains call, and select sound exhaust diverter system compatible
  • XL Risers include O2 Sensor bungs and plugs.
  • Kit includes all bolts and gaskets needed for installation

Seaward Series "Alpha/Bravo XL" Small Block Chevrolet Exhaust System

Starting From:
$2,799.99
This Part has options, please click the button below to order.

Seaward Series "Alpha/Bravo XL" Small Block Chevrolet Exhaust System

620-38048 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines up to 400HP 
  • XL Riser for performance applications
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Kit includes all bolts and gaskets needed for installation

Seaward Series "Alpha/Bravo" LS Chevrolet Exhaust System

Starting From:
$2,199.99
This Part has options, please click the button below to order.

Seaward Series "Alpha/Bravo" LS Chevrolet Exhaust System

620-38152 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines 4.8 to 6.2L up to 400HP (Camshaft duration not to exceed 218 degrees @.050 Duration) 
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Cast Aluminum Heat treated tubular tuned runner header style internal manifold core for header like performance 
  • Drawformed Non-porous manifold shells are powder-coated for corrosion protection
  • Silent choice, captains call, and select sound exhaust diverter system compatible
  • Risers include O2 Sensor bungs and plugs.
  • Kit includes all bolts and gaskets needed for installation

Seaward Series "Alpha/Bravo" Small Block Chevrolet Exhaust System

Starting From:
$1,999.99
This Part has options, please click the button below to order.

Seaward Series "Alpha/Bravo" Small Block Chevrolet Exhaust System

620-38045 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines up to 350HP 
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Silent choice, captains call, and select sound exhaust diverter system compatible
  • Risers include O2 Sensor bungs and plugs.
  • Kit includes all bolts and gaskets needed for installation

Seaward Series Big Block Chevy Exhaust System

Starting From:
$2,799.99
This Part has options, please click the button below to order.

Seaward Series "Bravo - 3" Taller" Big Block Chevrolet Exhaust System

620-38037 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines up to 415HP 
  • 3" taller riser for tall riser applications
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Silent choice, captains call, and select sound exhaust diverter system compatible
  • Kit includes all bolts and gaskets needed for installation

Seaward Series Big Block Chevy Exhaust System

Starting From:
$2,999.99
This Part has options, please click the button below to order.

Seaward Series "Bravo - 6" Taller" Big Block Chevrolet Exhaust System

620-38108 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines up to 415HP 
  • 6" taller riser for tall riser applications
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Silent choice, captains call, and select sound exhaust diverter system compatible
  • Kit includes all bolts and gaskets needed for installation

Seaward Series Big Block Chevy Exhaust System

Starting From:
$2,699.99
This Part has options, please click the button below to order.

Seaward Series "Bravo XL" Big Block Chevrolet Exhaust System

620-38038 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on performance OEM engines up to 450HP 
  • XL Riser for performance applications
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Kit includes all bolts and gaskets needed for installation

Seaward Series Big Block Chevy Exhaust System

Starting From:
$2,399.99
This Part has options, please click the button below to order.

Seaward Series "Bravo" Big Block Chevrolet Exhaust System

620-38035 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines up to 415HP 
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Silent choice, captains call, and select sound exhaust diverter system compatible
  • Kit includes all bolts and gaskets needed for installation
  • Risers include O2 Sensor bungs and plugs.
  • Sold in pairs

Seaward Series "Dry Pipe" Small Block Chevrolet Exhaust System

Starting From:
$2,999.99
This Part has options, please click the button below to order.

Seaward Series "Dry Pipe" Small Block Chevrolet Exhaust System

620-38114 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines 500+ HP 
  • 4" Dry Riser for performance applications
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Kit includes all bolts and gaskets needed for installation

Seaward Series Big Block Chevy Exhaust System

Starting From:
$3,899.99
This Part has options, please click the button below to order.

Seaward Series "Dry Tailpipe" For Stock Bravo Exit Location Big Block Chevy Exhaust System

620-38112 + Option(s)

Custom Measurements
Mercury Standard Exhaust Hole Locations

With the overwhelming success of the performance of Seaward exhaust manifold system it was only natural to expand into even more offerings. This latest version uses custom built dry tailpipes for a purpose built custom exhaust system.

Dry tailpipes refers to tailpipes that are water jacketed all the way towards the end of the tailpipe. This eliminates water mixing with the exhaust stream and causing "reversion" scenarios. This solid tailpipe design runs all the way through the transom and terminates approximately 5" outside the boats transom. A water discharge bung is provided in the top of the tailpipe inside of the transom and requires a separate water dump line and exit fitting. ***The line, fitting, and discharge fittings are sold separate.

These style of tailpipes require transom sealing rings that are again sold separately. Here is an example of what is commonly used 620-906700.

The Seaward exhaust systems will be the biggest market changing product to debut in 2016. These exhaust systems were not only created using the most modern robotic electronic machine operations but with state of the art tooling. What does all of this mean? It means you can now buy the very best reliable performance exhaust manifold system that money can buy for a whole lot less money.

Hardin looked at the exhaust market in the same fashion the worlds top manufacturers have in that through the most modern state of the art design and production efficiency we could build the best product and reduce the overall cost by hundreds of dollars over anything even remotely comparable in the world today

The SEAWARD debut is a 100% all new design these exhaust systems were built to provide virtually every feature once desired in a performance marine exhaust system with reliability and longevity being the key features.

Here's the facts: There is no other performance exhaust manifold system on the market today that with as many features and advancements in construction PERIOD. Starting with a 356T Heat treated tubular style cast internal core that has been optimized to flow with the technology design and shape and design of a tubular header. By extending the runners and separating the exhaust pulses to the collector this system produces maximum power in a compact design.

More Facts: 1000 hour salt spray coating. That's right this industry has never seen these types of processes. These products are extending the naval and aerospace program products as much as ten years. Sure the finish is that of a show piece, but it's truly what you can't see that sets these systems apart. Underneath the thick non-porous billet heat treated aluminum casing lies the most exceptional foundation of corrosion protection found anywhere. A hydrogen infused zinc process is applied to each manifold. Until now salt spray testing could merely only withstand 100-150 hours of sustained exposure, Today those numbers are 1000 hours of durability.

More facts: Tailpipes --- Not all are created equal --- Beauty is well beyond skin deep here as the beautifully polished stainless steel exhaust risers of the systems are manufactured from 316L Stainless Steel while inferior systems choose inferior stainless (303/304 Auto Grade) steel, Seaward systems offer nothing but the best money can buy which has been proven to be the most durable long lasting product for marine use.

The new Seaward System bears all of the superior quality's of their standard seaward system with the addition of a companion tailpipe allowing the connection of the factory tailpipe already in use. This is the perfect solution for engines equipped with silent choice or custom tailpipes as the user can still retain those. each kit comes complete with all necessary hardware for a complete installation.

FITS: Custom Big Block Chevy Dry Tailpipe applications.

NOTE: This system is ***STANDARD BRAVO EXIT LOCATION ONLY*** All others are built by quote only! Contact us for a quote.

***NOTE*** Modified engines often have different deck heights and raised exhaust ports with aftermarket cylinder heads. These tailpipes must be confirmed using this measurement sheet.


Seaward Series "Jet Boat" LS Chevrolet Exhaust System

Starting From:
$2,399.99
This Part has options, please click the button below to order.

Seaward Series "Jet Boat" LS Chevrolet Exhaust System

620-38154 + Option(s)

  • Manifolds are powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines 4.8 to 6.2L up to 425HP (Camshaft duration not to exceed 224 degrees @.050 Duration) 
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Cast Aluminum Heat treated tubular tuned runner header style internal manifold core for header like performance 
  • Drawformed Non-porous manifold shells are powder-coated for corrosion protection
  • These Lower Exit Risers are perfect for many inboard ski/wake or Jet Boat applications requiring additional exhaust exit downslope
  • Include O2 Sensor bungs and plugs
  • Kit includes all bolts and gaskets needed for installation

Seaward Series Big Block Chevy Exhaust System

Starting From:
$2,399.99
This Part has options, please click the button below to order.

Seaward Series "Low Exit" Big Block Chevrolet Exhaust System

620-38181 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on performance OEM engines up to 450HP 
  • Riser designed for Jet boat performance applications or boats with a crank centerline style exhaust exit
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Kit includes all bolts and gaskets needed for installation

Seaward Series "Low Exit" Small Block Chevrolet Exhaust System

Starting From:
$2,299.99
This Part has options, please click the button below to order.

Seaward Series "Low Exit" Small Block Chevrolet Exhaust System

620-38182 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on jet boat applications or boats with a crank centerline style exhaust exit to 400HP 
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Kit includes all bolts and gaskets needed for installation

Seaward Series Big Block Chevy Exhaust System

Starting From:
$3,599.99
This Part has options, please click the button below to order.

Seaward Series "Low Port" Big Block Chevrolet Exhaust System

620-38105 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on performance OEM engines up to 450HP 
  • Low Port Riser for below platform or other low exit applications
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Kit includes all bolts and gaskets needed for installation

Seaward Series "Ski Boat" Small Block Chevrolet Exhaust System

Starting From:
$3,599.99
This Part has options, please click the button below to order.

Seaward Series "Ski Boat" Small Block Chevrolet Exhaust System

620-38116 + Option(s)

  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines up to 400HP 
  • 3.5" Outlet Riser for performance ski boat applications
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD  (3.5" outlet)
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Kit includes all bolts and gaskets needed for installation

Seaward Series Big Block Chevy Exhaust System
Your Price:
$4,999.99

This Part has options, please click the button below to order.

Seaward Series 525 EFI Staggered-Custom Exhaust Systems

620-38043

The Seaward exhaust systems will be the biggest market changing product to debut in 2016. These exhaust systems were not only created using the most modern robotic electronic machine operations but with state of the art tooling. What does all of this mean? It means you can now buy the very best reliable performance exhaust manifold system that money can buy for a whole lot less money.

Hardin looked at the exhaust market in the same fashion the worlds top manufactures have in that through the most modern state of the art design and production efficiency we could build the best product and reduce the overall cost by hundreds of dollars over anything even remotely comparable in the world today

The SEAWARD debut is a 100% all new design these exhaust systems were built to provide virtually every feature once desired in a performance marine exhaust system with reliability and longevity being the key features.

The Seaward 525/600/700SCI staggered-custom exhaust system offering is designed for the boats the were originally equipped with their engines in a staggered formation placing one engine fore and aft of each other. Traditionally the front engine was equipped with a taller set of headers that often had unique tilt and angle to overcome passing the tailpipes past the rear engine.

These systems feature all of the superb Seaward features along with a 316L polished intermediate connecting tailpipe allowing use or re-use of the boats original tailpipe just as a direct replacement to the factory headers. These systems are one of kind custom built systems per application and are priced based on a complete filled out measurement sheet that must be provided by the purchaser.

Here's the facts: There is no other performance exhaust manifold system on the market today that with as many features and advancements in construction PERIOD. Starting with a 356T Heat treated tubular style cast internal core that has been optimized to flow with the technology design and shape and design of a tubular header. By extending the runners and separating the exhaust pulses to the collector this system produces maximum power in a compact design.

More Facts: 1000 hour salt spray coating. That's right this industry has never seen these types of processes. These products are extending the naval and aerospace program products as much as ten years. Sure the finish is that of a show piece, but it's truly what you can't see that sets these systems apart. Underneath the thick non-porous billet heat treated aluminum casing lies the most exceptional foundation of corrosion protection found anywhere. A hydrogen infused zinc process is applied to each manifold. Until now salt spray testing could merely only withstand 100-150 hours of sustained exposure, Today those numbers are 1000 hours of durability.

More facts: Beauty is well beyond skin deep here as the beautifully polished stainless steel exhaust risers of the systems are manufactured from 316L Stainless Steel while inferior systems choose inferior stainless (303/304 Auto Grade) steel, Seaward systems offer nothing but the best money can buy which has been proven to be the most durable long lasting product for marine use.

Hardin Marine Innovates yet again and takes the performance marine exhaust world by storm. That's a FACT as Hardin releases the very first and ONLY DIRECT BOLT-ON (no drilling, no tapping required) for the Mercury Racing's popular 525EFI engines. Until now the industry was plagued with poor quality OEM factory tubular headers know to fail early or expensive tubular stainless replacements. Note: All 525EFI Seaward applications use a 4" intermediate tailpipe section and NOW all 600/700SCI engines will use a 4-1/2" intermediate tailpipe.

 

With a loud outspoken cry from the boating community for a reliable , powerful, cost effective option the folks at Hardin set out to build not only the perfect exhaust system but a system around their new SEAWARD exhaust that would easily retro-fit the OEM headers. The new Seaward System bears all of the superior quality's of their standard seaward system with the addition of a companion tailpipe allowing the connection of the factory tailpipe already in use. This is the perfect solution for engines equipped with silent choice or custom tailpipes as the user can still retain those. each kit comes complete with all necessary hardware for a complete installation.


Seaward Series Big Block Chevy Exhaust System
Your Price:
$4,599.99

Seaward Series 525 Exhaust System

620-38040

The Seaward exhaust systems will be the biggest market changing product to debut in 2016. These exhaust systems were not only created using the most modern robotic electronic machine operations but with state of the art tooling. What does all of this mean? It means you can now buy the very best reliable performance exhaust manifold system that money can buy for a whole lot less money.

Hardin looked at the exhaust market in the same fashion the worlds top manufactures have in that through the most modern state of the art design and production efficiency we could build the best product and reduce the overall cost by hundreds of dollars over anything even remotely comparable in the world today

The SEAWARD debut is a 100% all new design these exhaust systems were built to provide virtually every feature once desired in a performance marine exhaust system with reliability and longevity being the key features.

Here's the facts: There is no other performance exhaust manifold system on the market today that with as many features and advancements in construction PERIOD. Starting with a 356T Heat treated tubular style cast internal core that has been optimized to flow with the technology design and shape and design of a tubular header. By extending the runners and separating the exhaust pulses to the collector this system produces maximum power in a compact design.

More Facts: 1000 hour salt spray coating. That's right this industry has never seen these types of processes. These products are extending the naval and aerospace program products as much as ten years. Sure the finish is that of a show piece, but it's truly what you can't see that sets these systems apart. Underneath the thick non-porous billet heat treated aluminum casing lies the most exceptional foundation of corrosion protection found anywhere. A hydrogen infused zinc process is applied to each manifold. Until now salt spray testing could merely only withstand 100-150 hours of sustained exposure, Today those numbers are 1000 hours of durability.

More facts: Beauty is well beyond skin deep here as the beautifully polished stainless steel exhaust risers of the systems are manufactured from 316L Stainless Steel while inferior systems choose inferior stainless (303/304 Auto Grade) steel, Seaward systems offer nothing but the best money can buy which has been proven to be the most durable long lasting product for marine use.

Hardin Marine Innovates yet again and takes the performance marine exhaust world by storm. That's a FACT as Hardin releases the very first and ONLY DIRECT BOLT-ON (no drilling, no tapping required) for the Mercury Racing's popular 525EFI engines. Until now the industry was plagued with poor quality OEM factory tubular headers know to fail early or expensive tubular stainless replacements. Note: All 525EFI Seaward applications use a 4" intermediate tailpipe section and NOW all 600/700SCI engines will use a 4-1/2" intermediate tailpipe.

 

With a loud outspoken cry from the boating community for a reliable , powerful, cost effective option the folks at Hardin set out to build not only the perfect exhaust system but a system around their new SEAWARD exhaust that would easily retro-fit the OEM headers. The new Seaward System bears all of the superior quality's of their standard seaward system with the addition of a companion tailpipe allowing the connection of the factory tailpipe already in use. This is the perfect solution for engines equipped with silent choice or custom tailpipes as the user can still retain those. each kit comes complete with all necessary hardware for a complete installation.


Seaward Series 6.2L, 350 Mag MPI, 350 MPI Alpha-Bravo EC  (Catalyzed-Delete) 2" Taller Exhaust System

Starting From:
$4,999.99
This Part has options, please click the button below to order.

Seaward Series 6.2L, 350 Mag MPI, 350 MPI Alpha-Bravo EC (Catalyzed-Delete) 2" Taller Exhaust System

620-38208 + Option(s)

  • Eliminate Catalyzed Exhaust Systems
  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines up to 400HP 
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Kit includes all bolts and gaskets needed for installation
  • Requires Catalyst Eliminator Computer (See Related Parts)
  • 2" Taller Than Stock Risers
  • We need to know your current riser height to make sure the risers will fit. See this image, we need height labeled "C". or find the part number on the riser such as in this image.

NOTE: THIS SYSTEM REQUIRES A HIGH DEGREE OF TECHNICAL APTITUDE TO INSTALL AND CONFIGURE. YOU MUST CALL AND SPEAK WITH OUR TECH SUPPORT DEPARTMENT BEFORE GETTING A QUOTE.

WARNING! This system is not to be used on emissions regulated waterways. The intent of this system is to allow the running of a catalyzed marine engine without the catalytic converters installed and without triggering any ECU error codes. With the engine operating in this condition, the emissions control system will be rendered inoperative. For this reason, do not operate the vessel on emissions regulated waterways. This system is not legal for any purpose other than testing purposes and not for use on any state or federal waterway.


Seaward Series 6.2L, 350 Mag MPI, 350 MPI Alpha-Bravo EC  (Catalyzed-Delete) Exhaust System

Starting From:
$3,899.99
This Part has options, please click the button below to order.

Seaward Series 6.2L, 350 Mag MPI, 350 MPI Alpha-Bravo EC (Catalyzed-Delete) Exhaust System

620-38123 + Option(s)

  • Eliminate Catalyzed Exhaust Systems
  • Manifold is powder-coated for corrosion protection
  • Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  • Perfect for use on OEM engines up to 400HP 
  • Polished Stainless steel tailpipe is manufactured from premium 316L Stainless steel, 4" OD 
  • 356T Aluminum Heat treated tubular style cast internal manifold core for header like performance
  • Kit includes all bolts and gaskets needed for installation
  • Requires Catalyst Eliminator Computer (See Related Parts)
  • We need to know your current riser height to make sure the risers will fit. See this image, we need height labeled "C". or find the part number on the riser such as in this image.

NOTE: THIS SYSTEM REQUIRES A HIGH DEGREE OF TECHNICAL APTITUDE TO INSTALL AND CONFIGURE. YOU MUST CALL AND SPEAK WITH OUR TECH SUPPORT DEPARTMENT BEFORE GETTING A QUOTE.

WARNING! This system is not to be used on emissions regulated waterways. The intent of this system is to allow the running of a catalyzed marine engine without the catalytic converters installed and without triggering any ECU error codes. With the engine operating in this condition, the emissions control system will be rendered inoperative. For this reason, do not operate the vessel on emissions regulated waterways. This system is not legal for any purpose other than testing purposes and not for use on any state or federal waterway.


Seaward Series Big Block Chevy Exhaust System
Your Price:
$0.00

CALL TO ORDER

Seaward Series 600 / 700 Exhaust System with 4-1/2" Pipes

620-38090

The Seaward exhaust systems will be the biggest market changing product to debut in 2016. These exhaust systems were not only created using the most modern robotic electronic machine operations but with state of the art tooling. What does all of this mean? It means you can now buy the very best reliable performance exhaust manifold system that money can buy for a whole lot less money.

Hardin looked at the exhaust market in the same fashion the worlds top manufactures have in that through the most modern state of the art design and production efficiency we could build the best product and reduce the overall cost by hundreds of dollars over anything even remotely comparable in the world today

The SEAWARD debut is a 100% all new design these exhaust systems were built to provide virtually every feature once desired in a performance marine exhaust system with reliability and longevity being the key features.

Here's the facts: There is no other performance exhaust manifold system on the market today that with as many features and advancements in construction PERIOD. Starting with a 356T Heat treated tubular style cast internal core that has been optimized to flow with the technology design and shape and design of a tubular header. By extending the runners and separating the exhaust pulses to the collector this system produces maximum power in a compact design.

More Facts: 1000 hour salt spray coating. That's right this industry has never seen these types of processes. These products are extending the naval and aerospace program products as much as ten years. Sure the finish is that of a show piece, but it's truly what you can't see that sets these systems apart. Underneath the thick non-porous billet heat treated aluminum casing lies the most exceptional foundation of corrosion protection found anywhere. A hydrogen infused zinc process is applied to each manifold. Until now salt spray testing could merely only withstand 100-150 hours of sustained exposure, Today those numbers are 1000 hours of durability.

More facts: Beauty is well beyond skin deep here as the beautifully polished stainless steel exhaust risers of the systems are manufactured from 316L Stainless Steel while inferior systems choose inferior stainless (303/304 Auto Grade) steel, Seaward systems offer nothing but the best money can buy which has been proven to be the most durable long lasting product for marine use.

Hardin Marine Innovates yet again and takes the performance marine exhaust world by storm. That's a FACT as Hardin releases the very first and ONLY DIRECT BOLT-ON (no drilling, no tapping required) for the Mercury Racing's popular 600SCI, and 700SCI engines. Until now the industry was plagued with poor quality OEM factory tubular headers know to fail early or expensive tubular stainless replacements. Note: All 525EFI Seaward applications use a 4" intermediate tailpipe section and NOW all 600/700SCI engines will use a 4-1/2" intermediate tailpipe.

 

With a loud outspoken cry from the boating community for a reliable , powerful, cost effective option the folks at Hardin set out to build not only the perfect exhaust system but a system around their new SEAWARD exhaust that would easily retro-fit the OEM headers. The new Seaward System bears all of the superior quality's of their standard seaward system with the addition of a companion tailpipe allowing the connection of the factory tailpipe already in use. This is the perfect solution for engines equipped with silent choice or custom tailpipes as the user can still retain those. each kit comes complete with all necessary hardware for a complete installation.