View Single Post
      05-12-2013, 08:09 AM   #3
United Kingdom

Drives: M3
Join Date: Apr 2012
Location: Over there

Posts: 1,215
iTrader: (0)

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?