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Seriously? I have personally dyno'd my previous car before and after exhaust (same day)and gained almost 20whp. If this exhaust is eliminating 2 cats for us n54 guys and eliminating the rear muffler......there should be signifigant hp gains. Not to mention less bends and the 3.5" piping. Exhausts DO make power on turbo cars. If I see proof that the factory exhaust flows well enough that even this system doesn't show gains then I'll just stay stock. $1500 for no results on the dyno? I don't think so
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