Try the ice section of the forum. I think mp3 CDs were an option, it will say mp3 on the stereo, my 2006 159 has not got the mp3 cd function. There are cables which fit to the CD changer input, and another Ive read about for £8 which fits on the phone output, again ice section will tell you.
The USB port in glovebox is a part of blue and me and cannot be retro fitted, or so ive read. But it can be emulated with a few different aftermarket devices.
Last edited by jonnym; 02-08-12 at 12:06.
Reason: originally typed on phone and made no sense