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I think Cobb is the best tuning company for turbocharged engines and i am sure they will come out with the tune for m3/4.
I have their stage 2 tune plus a few other things in my 135i n55 engine, and let me tell you that this car is flying, especially now, cold temp, low 20s. I am impressed with this engine, and i can only imagine what this modified engine by bmw will be after tuning by Cobb.
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