Agree very mediocre system in the G80. There are other posts in this forum about people making strides on the audio front that I have been watching.
Coding Bowers and Wilkins:
https://g80.bimmerpost.com/forums/sh....php?t=1845445
Amp Upgrade:
https://g80.bimmerpost.com/forums/sh....php?t=1850022
Personally I just dropped mine off at a specialized car audio place here in St. Louis. They won't do any audio mods until they insulate the doors to hear the real sound with good insulation around the speakers. Then they'll start testing the internal sound for recommendations on what to do. I'm at least planning to upgrade the speakers, and add a sub in the trunk, and will see what else they suggest. Not a cheap process but I can't stand having this great of a car with no emotion in the music....