EFI Upgrade Kits
HP525 Bored Throttle Body 1300CFM

500 EFI Bored Throttle Body 1000CFM

620-15530
Your Price:
$629.99

Quantity:  
500 EFI Bored Throttle Body 1000CFM

Hardin Marine has taken your factory Mercury Racing EFI throttle body and combined their precision machining and tuning experience into a power producing option for all Mercury 500/525 EFI applications.

These “Monoblade” throttle bodies flow 1000 CFM to match Mercury’s 525HP EFI engine. The “Monoblade” has self lubricating bronze bushings for the shaft to rotate on, knife edged stainless steel throttle blade,  Stock OEM sensors and throttle cable mounts in the original location. 25 HP gain is available with recalibration of the ecu and the throttle valve. Port matching to the plenum chamber is required.

Note: You will have to remove and send in your throttle body to have this process done. This is not a shelf item. Please call our technical staff for any questions or assistance on the process.

HP525 Bored Throttle Body 1300CFM

HP525 Bored Throttle Body 1300CFM

620-15535
Your Price:
$599.99

Quantity:  
HP525 Bored Throttle Body 1300CFM 

Hardin Marine has taken your factory Mercury Racing EFI throttle body and combined their precision machining and tuning experience into a power producing option for all Mercury 500/525 EFI applications.

These throttle Bodies reinstall easily providing an OEM fit while offering improved performance and quality than the stock OEM units. A factory stock 1080CFM unit is CNC Machined, Ported, and finally flowed to 1308CFM. A new larger precision knife blade style throttle blade is then hand contoured and (Blue Printed) to the throttle body bore. This delivers Increased airflow, improved throttle response, as well as 10-15 additional horsepower. These units are sold on an exchange basis. Note an aftermarket flame arresstor is suggested (Part #625-5250)  due to the increased throttle bore opening size 

Note: You will have to remove and send in your throttle body to have this process done. This is not a shelf item. Please call our technical staff for any questions or assistance on the process.

Mercury Racing 600/662/700SCM Stage 1 Kit

Mercury Racing 600/662/700SCM Stage 1 Kit

620-75325
Your Price:
$2,699.99

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Mercury Racing 600/662/700SCM Stage 1 Kit

In order to take advantage of the performance calibration we need to let the engine breathe and process those gases efficiently. This is completed by down sizing the supercharger pulley to slightly increase air output. Next a beautiful billet high flow flame arrestor is introduced to allow the supercharger to draw the added air into the engine. Processing this added air will require cooling the engine just slightly as well as cooling the intake air charge through a bolt on water system upgrade to increase system pressure and intercooler efficiency, These power increase vastly improve onto plane times with a big gain in acceleration. By increasing the factory rpm limiter this gives customers the ability to greatly increase top speed MPH while running original props. The stock RPM limit of 5400 is modified to 6000rpm. This Stage 1 upgrade features a performance computer recalibration that increases the maximum power output by more than 138HP* and 122 ft pounds of torque*.

Components Include:
  • Stage 1 Performance computer recalibration
  • High flow Billet Flame Arrestor
  • New Supercharger pulley
  • Hi flow Intercooler plumbing fitting kit
  • Low temp high flow thermostat
  • Performance computer recalibration
  • All of necessary components to required to make this system functional and reliable.


Mercury Racing 600/662/and 700SCM Stage 2

Mercury Racing 600/662/700SCM Stage 2

620-75330
Your Price:
$3,299.99

Quantity:  
Mercury Racing 600/662/and 700SCM Stage 2

The Stage 2 system provides even more power than stage 1 (approx 20HP more). This is accomplished through a more aggressive performance tuned PCM calibration as well as by increasing the supercharger output (increased boost) as well as a cooler set of spark plugs to increase combustion deficiency.

Kit Performance features:
  • Hi-performance PCM calibration with MPH gains of up to 9-10mph
  • Increased horsepower for improved top speed
  • Increased low-end torque for decreased planing time
  • Increased low, mid and high speed torque for better acceleration with improved throttle response
  • Increased spark at low and mid speeds for increased overall performance
  • Stock 5400 RPM limit is increased to 6000 RPM giving increased propping range and more power
  • 91 octane safe (RON+MON)/2
  • Stock idle, starting and drive-ability quality is retained


SE Special Edition Tuning Kit For MerCruiser 454 & 502 Magnum MPI Engines

SE Special Edition Tuning Kit For MerCruiser 454 & 502 Magnum MPI Engines

620-75304
Your Price:
$239.99

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"SE" Special Edition Tuning Kit For MerCruiser 454 & 502 Magnum MPI Engines

This kit is an excellent choice for those just beginning performance modifications on a MerCruiser Magnum EFI Series engine. This kit includes the "SE" Special Edition flame arrestor that utilizes a high flow K&N clamp-on style filter element and high velocity air inlet adapter which increases air flow by as much as 20%. The included Flow Command adjustable fuel pressure regulator allows you to tune to the proper air flow by allowing adjustments from 25 to 65 PSI.


SS Sport Series Tuning Kit For MerCruiser 454 & 502 Magnum MPI Engines

SS Sport Series Tuning Kit For MerCruiser 454 & 502 Magnum MPI Engines

620-75305
Your Price:
$589.99

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"SS" Sport Series Tuning Kit For MerCruiser 454 & 502 Magnum MPI Engines

Do you want quicker acceleration, faster planing, and increased performance of up to 15 HP? If so, the "SS" Super Sport tuning kit for your MerCruiser Magnum MPI engine is what you need. This kit includes the "SS" Sport Series flame arrestor that utilizes a clamp-on styleK&N element with our high velocity style air inlet. This kit include re-programming of your factory ECU in which we will modify both the fuel and spark curves as well as increasing your rev limiter and injector timing to 5400 RPM. This kit also comes with an adjustable billet Flow Command fuel pressure regulator that allows you to tune your air fuel mixture for optimum performance.

NOTE: You will need to send us your ECU with this questionnaire for re-calibration.


Stage 1 Upgrade for Mercury 525 EFI

Stage 1 Upgrade for Mercury 525 EFI

755-6830
Your Price:
$1,499.99

Quantity:  
Stage 1 Upgrade for Mercury 525 EFI

Performance computer recalibration and a Custom High flow Billet Flame Arrestor that increases the maximum power by more than 25HP* and 30 pounds of torque*. This upgrade will not only improve overall top end power but it also increases the low end power for a decrease in on to plane time and a gain in acceleration you can feel. The Preset Mercury racing factory rpm limit is also increased from 5400 to 6000 this is the point the the factory power band peaks. Part # 755-6830

Stage 2 Upgrade for Mercury 525 EFI

Stage 2 Upgrade for Mercury 525 EFI

755-6835
Your Price:
$2,099.99

Quantity:  
Stage 2 Upgrade for Mercury 525 EFI

Performance computer recalibration and a Custom High flow Billet Flame Arrestor, and Modified 1300CFM Throttle body(exchange) that increases the maximum power by more than 35HP* and 38 pounds of torque*. This upgrade will not only improve overall top end power but it also increases the low end power for a decrease in on to plane time and a gain in acceleration you can feel. The Preset Mercury racing factory rpm limit is also increased from 5400 to 6000 this is the point the the factory power band peaks. Part # 755-6835

Stage 1 Upgrade for Mercury 525 EFI

Stage 3 Upgrade for Mercury 525 EFI

755-6840
Your Price:
$6,299.99

Quantity:  
Stage 3 Upgrade for Mercury 525 EFI

Performance computer recalibration, Custom High flow Billet Flame Arrestor, Modified 1300CFM Throttle body(exchange). Dart Pro1 Marine Cylinder head kit, pushrods, ARP Cyl Head mounting hardware, Head, Intake, and Exhaust Gaskets. This kit has shown proven increases taking the maximum power out put up by more than 75-85HP* and 80 pounds of torque*. This upgrade is for the person seeking maximum power out put from their naturally aspirated Mercury racing 525 engine package. This kit offers a broad increase in power across the entire rpm power band. The Preset Mercury racing factory rpm limit is increased from 5400 to 6000 to take full advantage of the new components increased air flow capabilities. Part # 755-6840

Kit Performance features:
 
• 6000 RPM limit vs. stock 5400 RPM limit giving increased effectiveness of peak power band.
• Hi-performance PCM calibration
• Increased horsepower for increased top speed
• Increased low-speed torque for improved out of the hole launch
• Increased low, mid and high speed torque for better acc. & throttle response
• Increased spark at low and mid speeds for increased engine efficiency
• 91 octane safe (RON+MON)/2
• Stock idle, starting and drive-ability is maintained