I have BMW business unit from a 2001 3 series. Ideally I'd like to leave that in. What is the best form of ipod integration available to me? It doesn't seem to have an AUX in, so would my best bet be one of the devices that 'emulates' the CD changer? TBH what I'd ideally like would be a CD changer that can play MP3s. Can that be bought? Then I could just swap the CD changer I have to one that can play MP3 discs. EDIT > Have found something called a GROM which looks pretty cool. Puts the folders on your drive to 'discs' on the CD changer interface. Remove CD changer in boot, put in the GROM thing and buy a 16gb flash drive or something.