Thread: N54 Backfiring?
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      07-11-2011, 07:19 PM   #10
IGoFast1589
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Drives: 08 135i
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I apologize for the third post, but I can't modify a previous one from my phone. Dackel can be right about the gasket though, it's worth looking at. Also, I hope you have some sort of aftermarket tune with that downpipe otherwise I bet you that's your problem right there and you'd better fix that situation ASAP.
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