Quote:
Originally Posted by Vettezuki
I sure as heck don't understand all the combustion theory and engine dynamics, but it does seem one of the most commonly overdone mods for I4s is an overly large exhaust. As I understand it, the problem is excessively reducing cylinder back pressure, thus torque and finally power.
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Ok, why would want any back pressure? That ONLY causes the the in coming charge to be reduced. Thus less power.
