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Message: <blockquote data-quote="El_Diablo" data-source="post: 605698" data-attributes="member: 10652">trust me.... your not going to gain power by increasing pressure in the exhaustthere is nothing to the back pressure theory except for the old hot rodders making guesses... really, the reason you hear that is because basically, when you take a huge 3 inch exhaust pipe and throw it on a (for a bad example) civic, your lossing all of your velocity, but when you have a 1 inch pipe you have no flow, you ideally want a balance between flow and velocity, its the exact same theory behind head and intake porting aswell as aftermarket head selectionin the world of power, flow vs. velocity means EVERYTHING</blockquote>