Quote:
Originally Posted by Y2K_o__o
changing exhaust will not get you better mileage...
your car will only run rich if you mod the exhaust system without a tune...
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By increasing the exhaust flow, you are effectively allowing the turbo to spool faster and the engine to exhaust waste gas quicker. By doing so, you are putting less "restriction" into the exit path of the head, so your turbo will spool faster, at a lower rpm. By spooling lower, your turbo makes more power at a lower rpm, meaning you don't have to be on the throttle as much to get to the same amount of power to propel you forward.