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Old 09-12-2003, 11:24 PM   #7
AndyWRXWG
Scooby Specialist
 
Member#: 23784
Join Date: Aug 2002
Chapter/Region: MWSOC
Location: Mundelein, IL
Vehicle:
2005 M3
Tiag

Default

your back fireing is more to do with the free flowing exhaust than with ecu tuning. I just had an axel back and was getting backfireing before I got accessecu. put your cats back on and I'd bet your back fire problem will get a lot better.
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