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On the forum I participate in for 911's they had a car dyno'ed before and after showing between 25 and 35 RWH gain depending on the RPM.
All the exhaust modifications in the world won't create 25 to 35 horsepower gain at the wheels for either a boxster or 911 . Let alone simply drilling out the muffler .
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Don't worry … I've got the microfilm.
Last edited by Johnny Danger; 11-09-2011 at 10:39 AM.
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