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I can back the OP on this also. Exact same issue, posted my logs to N54Tech, and everyone said to lower my FOL, was at 93-95. Lowered it to 80 and been golden ever since!
Definitely worth a try.
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'10 N54 135i Cabrio || ///M-Sport || SCHWARZ/BEIGE
Mods: JB4, Trebila Custom tune, FBO, Fuel-It Stg2 LPFP, Berk Street Performance w/ Berk Resonated Midpipes, & lots of little body/OEM+ mods |