Quote:
Originally Posted by JohnnyGrey
This is definitely NOT a myth. An increase in exhaust diameter results in a reduction of exhaust velocity and therefore scavenging. Yes, a larger exhaust will open up your top end because there is a limit to exhaust gas velocity, but when you lose that velocity on the low end, you lose power. The same principle applies to the intake runners.
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i think were basically talking more about restrictions here, then using larger pipes, say a mutli baffled muffler vs a straight through glasspack