All, I read a thread on one of the M-B forums earlier today and found out that Becker can mod stock head units to allow for an aux input for things like ipod and XM. The thread dealt with several models of the Stock M-B stereo, but since the Crossfire unit is electrically identical to the M-B unit it might be worth checking out. The thread's author said he called Becker to arrange for the mod to be done. Here's the website with contact info:

http://www.beckerautosound.com/

Who wants to take this one and run with it?