I have one of the first '06 X5s and it is MP3 / Text capable - it displays the data on the nav screen from the CD changer

__________________
2006 BMW X5 4.8is Lemans Blue/Beige/Dark Maple
-Nav, Comfort Seats, Heated Steering Wheel,
Rear Airbags, AUX Input
2009 BMW M3 Space Grey/Black/Carbon
-all options