As standard, the Concert tape radio (non Bose) in my 1998 Audi A4 B5 did NOT have a CD changer fitted at the factory.
I am looking at getting one of the Connects2 or similar adapters that allow the use of an ipod through the CD changer input and allows the ipod to be controlled through the head unit. Something like this:
Audi Concert A2 A3 A4 A6 A8 TT iPod adapter interface iPhone CTAADIPOD003.2 AUX | eBay
But, as there has never been a CD changer fitted to the car (not a chosen factory option) will the radio pick up an ipod is there or will the radio need re-coding by Audi?