SAMUR6I,
If you have a CDR-220 radio it is pretty easy to have a direct connection.
Basically, you need to order 1 part from Becker for the CDR-220 and then a part from Monster Cable that plugs into the Ipod.
http://www.renntech.org/forums/index.php?showtopic=5731&hl=ipod
http://www.renntech.org/forums/index.php?showtopic=4393&hl=ipod
http://www.beckerautosound.com/soundadviceonline.html
Here is another option :
http://www.newertech.com/roadtrip
I used this in my Jag ( and tried it in the Box ) and it works great !
Hope that helps...
Thanks,
Nick