^^^Nope, completely wrong. It's the velocity of the exhaust gas that creates the extra torque (the exhaust creates a vaccuum in the piping and creates better exhaust scavenging). This might sound like backpressure, but remember backpressure is just air that is trying to go up the exhaust pipe, not down it. In this case, all the air is moving in the same direction. An exhaust with good flow will always create more power than one with any amount of backpressure. The trick is with NA cars, high velocity at low RPM means lots of backpressure at higher RPM. On forced induction cars, the piping should always be large, since there is a hell of a lot more air going through it.
|