According to my last Dyno from having my exhaust system installed, my Boxster rated 291 hp..
The end result of HP is based on several things. First off the quality of the parts you buy, the engineer tweaking your air/fuel mixtures, and whether you have a 2.5, 2.7, 3.2 or anything else.
The stats on the Twin Turbo are real too. I havent had this installed but have seen the Dyno results from the turbos on a 2.5 which TTP did in Europe this last fall.
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