The short answer is that I don't know. Just to chat, though, I can tell you what is in my 545i: It is the premium system, which is made by Hardon and has Logic 7 sound processing. I will tell you that compared to the Nakamichi system in my Lexus GS400, the BMW system is crap. (I've been wanting to say this on a BMW web site, but I didn't have the heart.)