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Originally Posted by f5fstop
Hope that is not from the southwest and some "GM engineer." Just a note, I can take any dyno graph and change it the way I like it. Not saying this is what happened, but, if GM could raise the HP (safely) with a tune, and a new cat back system and airbox, they would have already done it. I say safely, but I also mean legally.
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I don't think it was raised by that much.
There is no 100HP difference between BHP and rear wheel HP, which is what is being shown. Stock listed BHP for the H3 is what? somewhere around 220BHP and the stock rear wheel HP listed on the graph is about 138 HP. The coefficient for friction doesn't increase as the HP increases so one could naturally assume a 80HP difference. 153 + 80 = 233 or a net gain of about 13 BHP or somewhere around a 6% gain.