So I recently bought a 2000 A4 and it came with the Bose system. I was told you can't put a aftermarket CD player in because then you won't be able to retrieve the DTC's. The only reason I want to is for an AUX port. Anyone know a way around this or a way to hook up an AUX cable to plug into a headphone jack. I'm trying to stay away from the tape deck ones and radio broadcast ones because of the audio quality. Also, my driver side tweeter is blown, anyone know the size so I can look into replacing it, or is it a dealer only item being as it's the Bose. Thanks for your time.