Just did this install on my car too. See link below
Bowers and Wilkins speakers upgrade
https://g30.bimmerpost.com/forums/sh....php?t=1857152
__________________
2018 M550I Xdrive Alpine White on Cognac Leather, Premium Enhanced Package, Drivers Assitance Plus, Remote Parking/display key, massage seats, 21 wheels style 629 Black Chrome. M performance brakes in blue, M performance carbon fibre diffuser, m performance side skirt extensions, m performance front lip. 45% tint, roof wrapped in gloss black.