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Old 06-01-2009, 10:34 AM   #39
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2007 2.34LR, EFR7670
LINK G4+ hybrid STi


Originally Posted by unclemat View Post
So it seems that most folks who port their stock manifolds are actually hurting their performance (most run < 400 whp setups anyway).
Porting a stock manifold has a insignificant effect on runner or plenum volume and no effect on runner length so no I don't see how that could adversely affect performance.

The Cosworth mani changes all of the variables
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