I have an Ipod hooked up to my pioneer radio. I used the Pioneer CDRB10 with the PocketDock Line Out FW
http://www.sendstation.com/us/products/pd_lineout.html. The sound quality is excellent. The only good thing about the interface adapter is that it charges the ipod but it is a difficult to find a song from your headunit and alot of people gave it bad reviews.