Backfire / Pop - Does yours? [E92 M3 '07]
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05-12-2013, 09:09 AM
Join Date: Apr 2012
Location: Somewhere over the rainbow
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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