Originally Posted by Technic
OEM iPod adapter = dealer-installed accessory = mimic the OEM CD Changer = MOST for control/display/audio
OEM iPod/USB adapter = 6FL = MULF-HI = OEM HU with built-in USB = uses USB for control/display, AUX for audio (only applicable to iPod)/uses USB for control/display/audio (any USB device)
OEM iPod/USB adapter = 6VC = Combox = uses USB for control/display/audio
Thanks Technic, this should be stickied at the top. Also, I assume 6VC is only relevant for those with iDrive.