I had this on my Mercedes C250 cdi and hated it with a passion.. It was so bad I sold the car 3 months after I got it as I couldn't remove the exhaust (tried merc and aftermarket). It would sound great when giving it some but awful on idle, it was also very artificial..
On the merc it was a speaker that was put in a metal box then connected to power and a control unit. It would change tone depending on what mode the car was in (sport etc). On the merc they removed a silencer at the back and the speaker replaced it, it made it very boomy when ticking over
The sound is for outside not inside the car and if I am honest is sounded like it was fake.
The Audi system is very similar however that does sound better but still fake.
I really hope BMW have cracked it as my experience has been pretty bad with this sort of system
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C63 Coupe
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