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I have done several very long drives in a 640d fitted with B&O and was very impressed. The 640d is a fine car ....not as fruity as an M6 but can travel 500 miles on a single tank.
Naim and Meridian are also providing some excellent automotive sound systems.
I would definitely have B&O in a 6series. I have been told by a friend B&0 in the SL is worthwhile.
As ever with HiFi.... some systems work for the listener and some don't.