Hardin Marine

• 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

• 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

• 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

• 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

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.

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.

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.

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.

• 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.

• 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)
• 4" 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.

• 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.

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.

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.

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.

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.

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.

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.

• 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 
• Low Port 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

• Manifold is powder-coated for corrosion protection
• "Ocean Series" Extreme Corrosion Treatment included for additional interior corrosion protection 
  
• 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
  
• Sold in pairs
• No tailpipes included, replacement manifolds only!

• Manifold is powder-coated for corrosion protection
• "Ocean Series" Extreme Corrosion Treatment included for additional interior corrosion protection 
  
• 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
  
• Sold in pairs
• No tailpipes included, replacement manifolds only!

• Standard Manifold is powder-coated for corrosion protection
• Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  
• 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
  
• Sold in pairs
• No tailpipes included, replacement manifolds only!

Replacement riser gasket for Hardin Seaward manifolds and risers. 4-1/2" x 3" Bolt pattern.

• Standard Manifold is powder-coated for corrosion protection
• Optional "Ocean Series" Extreme Corrosion Treatment available for additional interior corrosion protection 
  
• 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
  
• Sold in pairs
• No tailpipes included, replacement manifolds only!

• DO YOU HAVE DRY JOINT EXHAUST? CLICK HERE TO LEARN MORE.
• Mercruiser Dry Joint Replacement
• Replaces 14 degree, Dry Joint "Tall" Riser systems, "Short" 7 degree systems will require custom tailpipes
• The term Mercruiser Dry Joint Exhaust refers to a later model (2002 and newer) OEM exhaust system which utilizes 2 coolant passages vs 4, between the manifold and riser that are separated outside of the exhaust gasket. 
• 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
• Risers include O2 Sensor bungs and plugs.
• MerCruiser changed their exhaust system design in 2002 by creating a Dry-Joint exhaust system thus removing the cooling water passages from the perimeter of the riser and manifold flange area.  Dry-Joint is a proven enhanced design exhaust manifold and exhaust riser compared to standard “Wet-Gasket” style of marine exhaust manifolds and exhaust risers common to early or old style marine industry offerings
  

This Shift / EFI bracket fits Hardin Marine Seaward Series Exhaust Systems. Can be used for either application.

NOTE: If using with a riser mounted O2 Sensor, modification to bracket will be required or O2 sensor moved inboard.

Seaward Standard 4" Bravo Dry Tailpipes - Sold As A Pair

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.

Seaward Standard Risers - Sold As A Pair

Serpentine 6-Rib Alternator Pulley (Fits a .670" Round Shaft) Fan sold separately

Hardin Marine makes the correct billet alternator pulley for your Mando alternator. Just slide yours off and replace it with the Hardin billet polished pulley.