Is there not a fiber optic system on the crossfire radio, or any other OEM Becker radios. I found a Porche cyanne that uses an almost identical radio as the crossfire except it was black and had a couple other neat features it might have an AUX port?. They are pretty cheap on ebay, and you get the wow factor of having your radio say porche,instead of Chrysler.
http://www.beckerautosound.com/chrys...ire/index.html
I don't know squat about radio systems but I though there was a remote CD changer for our car? correct me if I'm wrong. edit: the becker site states "CDR23/6627 This model did not offer an OEM AUX Input as specifeid by Porsche".

Becker N.America says there is a phone input, how does it differ from aux input?