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My car is a 2012 that came with the M Performance exhaust when I bought it. I have driven M3's with stock exhaust before. I will tell you this, I LOVE THIS EXHAUST. The sound is outstanding when I want it to be. There is a drone at a certain RPM but it quickly goes away once you are out of that resonance range. I never notice it, maybe once or twice since I bought the car 5 months ago. I love this exhaust. It is a head turner. It sounds amazing, it is a BMW product, not sure what else to say. I have absolutely nothing bad to say about it. LOVE is the word I guess, lol.
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