Quote:
Originally Posted by DannyRZ
Well maybe cuz with an N/A motor a 3in seems like too much in terms of lost back pressure where as with FI it makes mores sense
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Back pressure is basically a myth. It's exhaust gas velocity that is much more important. Modern high performance engines flow very well and a three inch exhaust for a naturally aspirated engine isn't out of the question anymore.
It would be interesting to see back to back comparisons of a well designed header (like the ACE) with both 3inch and 2.5inch single exit exhausts. I'm willing to bet you'd see a very small bump in power, especially at the top end.