OK,.. I am not to keen on this but I will try to explain it and I am sure some of the other guys will either explain it better or tell me that i am wrong. So, here goes,
You need backpressure for sacvanging effects and torque for the street. If you were at the race track and race track only you supposed to make more horsepower to go faster but make alot less torque which is needed for the street. Plus sound ordinances.
Now there are exhust companies out there that claim you will make more power with there exhust over open headers. Generally companies that sell X-pipes.
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