m-waage
Active LVC Member
Ill believe that you can find one where backpressure has capped off the HP and torque resulting in a smoother "Looking" powerband on a dyno chart in relation to HPvsRPM but find me the the same motor with different exhaust where it loses power with the removal of an exhaust restriction. You wont. If it haveing less backpressure results in a "Spikey" or "Narrow" powerband it is usually the result of tuning the in midrange areas or it is the mechanical design of the motor.