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      12-24-2012, 02:01 AM   #8
Jeff@TopGearSolutions
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Drives: C6 Z06, GSXR-750, 09 335i
Join Date: Dec 2008
Location: TopGearSolutions.com

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Put on some miles and see if it goes away, it's likely residue from the manufacturing process of the exhaust components. Especially when doing mandrel bending.