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      12-15-2012, 08:42 PM   #1
1stockbmw
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Drives: 2011 E90 335i PE
Join Date: Jul 2009
Location: Woodland Hills, CA

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Backfiring after JB4 ISO firmware update?

Hey guys so I was wondering if my car was supposed to be backfiring from updating to the ISO firmware. I know it is supposed to have the gurgling sound but the backfiring is new. Here is a video for reference. The motor is the N55 and this is already warmed up.