Seriously.. with a CDR-220, this is all you need:
http://cgi.ebay.com/PORSCHE-RCA-AUX-INPUT-iPOD-MP3-BECKER-XM-SIRIUS-/200446847336?pt=LH_DefaultDomain_0&hash=item2eab902968
then get a small adapter rca to 3.5mm and your in buziness to plug your Iphone/Ipod..
Easy Setup, no slycing anything.. only downside is that you can't use your CD-changer anymore.. but who care of a cd changer when you have way more music on your ipod?