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Hello persiangodfatha,
I have installed the M-exhaust. Look at the forum under 640i imola red with M performance. There is also a video with the sound, its the sound from a cold start. I liked the sound verry much and i have almost always the rear window open to hear that sound, even in winter. It is no difference in power only it feels like you have more power because of the sound. I bought it only for the sound it is better for my Imola red car.
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