Ok, I'm a car audio newb and am VERY unknowledgable about the different options. I have an Audi A4 with a 6 Disc changer in the trunk. The head unit is stock Audi. I'd like to upgrade to an Alpine to utilize the Ipod adapter. And, although I rarely use the CD player anymore, I'd still like to have it. Can someone tell me which Alpine head units, if any, are compatible with trunk mounted CD changers? Thanks in advance.