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      05-12-2013, 08:09 AM   #3
sylonien
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Drives: M3
Join Date: Apr 2012
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I wonder too, but like said, only does it after my new xpipe / backbox.

Maybe cause the second cat / resonator delete & new back box is letting
more sound / fuel burn in the exhaust when it did happen before but couldn't hear it?
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