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considering the same switch myself. my car has never really run great on the procede and I'm maxing out fuel trims up and down and it requires a lot of tweaking to get it right it seems...
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 Cobb E40 PROtune by Jake@PTF/RR catless DPs/aFe DCI/ETS 5" FMIC/ER CP/Forge DVs/Alpina B3 TCU flash/BMW Perf. Exhaust./BMW Performance Style 313s/M-Tech Rear |