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I just had stage 1 installed on my 2012 135 M Sport. Got it before the price went up. I also did a before and after dyno run. Saw 10 HP rise and 18 lbs torque rise. Neither is exactly as promised by BMW. I will say that the before run registered 286 HP, even with only 10% loss from shaft (unlikely) that means my car had more then 300HP before the PPK install.
Ignoring the "hard" numbers I can tell you I feel a noticeable increase in torque starting at lower revs. Using typical tuner speak, it definitely "pulls harder quicker"
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