KennyOffShore

520 Sport Tubes

• Increases in Horsepower up to 48 HP
• Downturn collector improves water fill
• Improved mid-range acceleration and torque
• Polished finish available
• Equalized primaries for greater performance
• Patented "Cool Collar" design
• Mandrel bent and formed from high quality 316L grade stainless steel

520 E-Top Headers

• Increases in Horsepower up to 31 HP
• Direct replacement — works with existing exhaust outlets
• Improved mid-range acceleration and torque
• Polished and satin finish available
• Patented "Cool Collar" design
• Mandrel bent and formed from high quality 316L grade stainless steel

violation98

Do you need ECM reflashing or any other modifications to make this safe for the engine? upgraded springs, etc?

thanks

bbcmi

Hello Violation98, Sorry for the delayed response.... There is no need to re flash the ECM to achieve the results we have noted in our site. It is simply a bolt on and go horsepower adder. If you have any questions feel free to reach out to us at 920-722-7084!
Here are the dyno results that we observed http://custommarine.com/headerapps/dyno_data_520.php
Chris