I think BMW shouldn't have gone for the $3700 B&O option. Instead they should have done something like a $1000 Mark Levinson Reference system with about 1000 Watts. That would have been much better value for the customers and also delivered a wow experience. Mark Levinson is owned by Harman so it they may have been able to negotiate around the Lexus exclusivity.
2014 ///M5 Individual
Frozen Grey, Silverstone Full Merino, Piano Black, Exec Pkg, Drivers assistance pkg, LED Package, Bang and Olufsen, 20" Forged wheels