Here is the list with of ID3 Audiotext supported in dash cd players and Cd changers

http://www.bimmerboard.com/forums/posts/243524

The changers work in all X5s and X3s but in order to have ID3 audiotext displayed the radio needs to be updated to a version built after 09/05 (possibly earlier in 05 production although not sure about full support).

The radio is in the trunk for the nav cars, and called the BM53
The in dash CD built after the dates on this document can also be retroftted in the older cars. If you have the round pin radio built before 08/01 you need the adapter harness to update the radio. Updating the radio will also give you Sirius support http://www.bimmernav.com/BMW_Sirius_..._Retrofit.html

Martin