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I have installed it on mine. Paid too much since in Belgium you cannot activate the performance part.
Regarding the exhaust, it is very subjective. I heard the akrapovic and did not like it. The frequency was just too high for my taste. The bmw sounds very loud from the outside, it just ROARS, sounds great. From the inside, it is much quieter, the car is well noise isolated.
When I put it into Sport while driving at slow speed, I open the windows to hear it better. On the highway it is no fun because you are coasting too much and too much wind gets in if you drive windows open.
It really depends on your personality, I really like it when accelerating even between 15 and 40 miles/hr but it is too loud when decelerating. Too many pops and bangs which you cannot control.
Can the pops & bangs be diminished by coding? I doubt it but I'll have to check.
I also deactivated the active sound because when in sport mode, there is a constant rumble in the car that gets very tirying.
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