We just bought a 2006 r350 with the entertainment option and the HK logic 7 radio. The CD behind the screen plays mp3 and shows track name on the screen and the instrument display. I burned the mp3 with musicmatch plus software 8.2, and I included album art, etc in the burn. I only loaded 88 tracks in one folder, but the manual states it will hold 255 folders. Next I'll need to try it in the 6 cd changer.