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Originally Posted by ChevyHighPerformance
Just as an example, here is someone else's dyno plot from another website for an H3 with an airbox, exhaust, and tuning. This after these mods the BHP is about 253 hp. From what I was told, this is without port matching of the CAI, stock throttle body, no thermal shields, and no cold air ducting. Also, this might have been with the stock resonator.
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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.