Quote:
Originally Posted by Z eliminator
Shumby made 390 rwhp at 6 lbs with stock exhaust manifolds and stock cat's. Not sure what exhaust he had.
Headers and high flow cats will cost you boost and RHWP.
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Just like Drag Radials will cost you E.T's at the track
Clearly the GTM stage 1 kit does not flow enough air plain and simple look at the graphs his numbers start to die off after he hits 8psi.
Secondly dont hold your breath for the stage 2 kit...