I am selling modified cables that allow your iPod to plug into your Porsche CR/CDR-220 head unit. It is one cable with one plug on either end (i.e. simple). It plays music through the audio system and charges your iPod. No wire splicing is needed for installation. Simply plug and play. Installation instructions are included.
You can read more about it all at my site (it is still under development):
http://www.iwirep.com/
Cheers,
-Jeremy