I think there is something wrong with the Cobalt. I've seen a stock Cobalt with a K&N drop in edge out a stock Evo from a 5 roll. That's just my experience though. Everybody's experiences differ. They then raced again from a dig and the Evo edged out the balt. Besides, there are different trim lovels of Evo's. Was this an MR, or of a lesser trim level. I think that is the important question one should be asking here. Some of the trim levels have different hp ratings.
07 Tahoe LT
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07 Sport Red 4 door SS:
-sticking around for now