Quote:
Originally Posted by Christ
If that's true, how are cat-back manufacturers and tuners alike showing off dyno runs where a cat-back exhaust system outflows stock and nets 5-15 HP gains?
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cause they are also pairing it with a retuned computer and cold air intake system. and thats cat back. he said muffler. just the muffler is about the least restrictive part on most automobiles. the exhaust gas is cool and lost its velocity by then so its not as big a deal. the headers and midpipe are where you make your best gains. and everyone knows that claims of 5-15hp for an exhaust (catback) are completely bogus anyways, its laughable