A few years ago purchased a Blaupunkt MP3 compact MP3 player for my E46. I never fitted it. It is still sitting in a box on a shelf here so decided to have a quick look at it. Actually never opened it. I also purchased a CD-Changer and kit for the E83. Never installed it because didn't want to use my center console space up. BUT if I could retrofit this little device near the center console I would have another source for music in the car. Looking at the wiring diagrams it appears to be basic - and would be an easy retrofit....

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E83 - Aero PKG Mods installed: Homelink mirror. CIS-IBUS video module, AUX, Rr Dr Release, stock wheels, Remote start, CarPC (Atom) & mud flaps - NAV - MKIV - NA Map DVD - 2011
E46 - 18.5 wheels/tires (summer), 17 stock (winter), Homelink, NAV software upgrade, BMW video module, Radio to V53, AUX, USB IBUS interface,BMW alarm install, CarPC(Epia), remote starter, tank battery & angel eyes. NAV - MKIII - NA Map CD - High Version 2008.1