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Just put an aFe stage 2 in my 2011 135i -- am going on a road trip this weekend, and should put plenty of miles on for the ECU to gather data. So far, it makes a cool nitrous-like whistle-psssst at shift points, and I think it's added some pop to the torque but I've literally driven it about 10 mi.
Will report in a few days...
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