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09-08-2011, 11:43 AM
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#8
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Sic 'Em Bears
Drives: 135i coupe Blk on Blk
Join Date: Mar 2010
Location: Waco/Houston, TX
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Its def. the wastegate. Mine does this all the time at a 70mph cruise. I have strait pipes and it is super noticable. I'm so used to it that I don't pay attention to it anymore.
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