when does it happen all the time??? certain rpm? speed? I had one at 2500rpm and above just a loose heat sheild!
give a little more info and im sure someone on here can help you out 
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1999 boxster yellow
mechanical-
evo intake, chip, desnorkled, boxster s exhaust & brakes, lowered w/ eibach & M030 combo
cosmetic-
gt2 bumper w/evo lip, TA side skirts, factory yellow painted interior, 18" turbo twists wrapped in AVS sports, 6 pack mp3
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