[Mnfamilyguy2020]

I have the B&O in my F06 my friend does not, nearly identical cars, same leather etc. He is constantly commenting on the sound differences between the HK and B&0, It really is dramatically different across all ranges.

On the retrofit.... He looked into doing it, the parts can be sourced for a decent amount of money, like others have mentioned the wiring changes are what shut him down. Some pretty extensive work for that part.