Just for comparison, I looked at my dyno. GT 2530's with ported stock exhaust manifold's do quite well... : Some HP numbers (taken from an earlier thread): HP @ 3k : Mike K-125 : ZO-120 : Bernie-125 Me- 150 : HP @ 3.5k : Mike K-200 : ZO-160ish : Bernie-190 Me- 220 : HP @ 4k : Mike K-300 : ZO-240 : Bernie-275 Me- 310 : HP @ 4.5k : Mike K-450 : ZO-390ish : Bernie-450 Me- 450 : Now ZO does have a stock engine, but so much for laggy sport 650s. : 
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