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      01-24-2013, 10:02 PM   #13
index1489's Avatar
Drives: Out of warranty BMW
Join Date: Sep 2008
Location: Chino, CA

Posts: 2,099
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There is a exhaust flap on one of the tailpipes that only opens after a certain engine RPM, if the car isn't revved very high past this point, no exhaust flows out of that pipe. Thats why one is more full of carbon then the other.
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