Hey blackjack, care to describe how the retro-fit went? What/where did you buy from? Did you install at the dealer?Finally got around to retro-fitting MMI High, Sat Nav and AMI to my A5. The effect of these changes on the quality of the B&O sound system is like night-and-day. The "missing" B&O sound focus and surround level options appeared and the general quality of sound improved significantly (after almost 2 years with the "old" system I have become very accustomed to how it sounded![]()