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      12-03-2012, 01:04 PM   #3
Jeff@TopGearSolutions
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Drives: C6 Z06, GSXR-750, 09 335i
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If they are brand new with less then 100 miles they will burn off some stuff.

Most people don't wipe down the pipes after install but they should as hands get greasy and sometimes there is an oily residue on exhaust components from the manufacturing process.