I got akrapovic slip-on(titan) with AR design DP's on my 335i and it was quiter than SS sport with stock DP's on my 1M not... I would say, that I didn't hear my akra at all in comparising with SS)
I think Akra slip-om with wireless kit will be the best choise and you can regulate the volume by pushing the button, but Akra is expensive
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