Originally posted by mpg9999
Just fyi, that is a myth. You do not need exhaust gas backpressure. That is not to say you cant go to big, because you can. You need to retain exhaust gas velocity, but with the least amount of backpressure possible.
-Mike
agreed.
on another note...exhaust gas velocity is also crucial for turbo cars too. though backpressure can be a hindernce to spool, a smooth and non turbulent exhaust route on turbo cars will outperform any open exhaust anyday.