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Mine is the X6 M50d, December 2019 build, and I think we might have a similar issue...accelerating slowly, at around 1500-1800 rpm, I hear a grinding, possibly hissing or vibrating noise from the rear...hard to describe. The dealer said it's the normal "performance" sound of the M50d and that was it.
Of course I didn't like their answer but had no time to investigate further. I still have no idea what it might be, I thought for a while that it was the exhaust tip cover vibrating at certain rpm range. Since it's tied to a specific rpm range it could be related to vibration of something. It can be heard in all modes and funny enough it's sometimes not there at all.
Love your enthusiasm to get to the bottom of this, will follow this thread for sure.
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