Yeah I tried this 4 years ago when I upgrade my dad 530i. I installed full Focal top of the line cost me 3,400 for the speakers only and another 2,600 for the 2 amps plus 2 subwoofers and an Audison Bit One processor. I looked extremely cool. However, today compare my 09' 650i with the Focal. The 650i come with Logic 7 but IMO sound almost the sane(u need to play with the EQ a bit though). Besides, my dad 530i now like an old man, easily have battery problems. When the fuse of the amps blow or it leaks, it automatically reset the whole system, which is annoy. Doesnt the grand coupe come with Bang & Olufson option? I'm going to get the M6 Grand Coupe in 3 years and I'll definitely get that option for my ears. Just my 2 cents.
2009 BMW 650i Cabrio (daily drive)
2011 Audi A4 (groceries, bully, road trip, winter beater, family car)
BMW CCA ID: 473647