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Old 09-25-2009, 09:43 PM   #11 (permalink)
TOOSTUBBORN2FAIL
EcoModding Apprentice
 
Join Date: Sep 2009
Location: Fresno, CA
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Deceptive - '98 Dodge Neon R/T
90 day: 44.38 mpg (US)
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Quote:
Originally Posted by JohnnyGrey View Post
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.

i think were basically talking more about restrictions here, then using larger pipes, say a mutli baffled muffler vs a straight through glasspack

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