The iPod interface for the Clarion CMD4 is
http://www.crutchfield.com/p_020EA12...terface&tp=120
It plugs into the CNet (cd changer port) in the back of the radio. I put this in my 2006 XStar and it worked great. Gives you the ability to Controll you iPod through the remotes and or head unit. I advise reading the instructions carefully after installing it, because it is an "interface, it essentially is tricking the head unit in thinking your iPod is a disc changer, because of this you have to rename your playlists clarion1, clarion2, clarion3 etc. as if your playlists are "discs". With your playlists renamed, this allows you to obviously track forward and back, and to select between your playlists by pressing up or down