Backfire / Pop - Does yours? [E92 M3 '07]
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05-12-2013, 08:09 AM
Drives: cardboard box
Join Date: Apr 2012
Location: recycling bin
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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