I personally don't see any reason to upgrade the sound system in any MB diesel. I still have the old Becker Mexico in my car, and it sounds great. When I want to listen to CDs, I pop in my portable CD player. The engine noise is so loud most of the time, that I don't see wasting the money on a new system, when what I have works. I also feel that I get way better recieption than many of the modern head units being sold today, and I don't want to loose that.