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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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