Brian, I have a 2001 X5 with navigation system and a CD changer. I know BMW dealers sell an aux kit for about 40 bucks, I am not sure if there is a 3 pin behind the radio, otherwise from what I have seen I would lose the CD changer, connect the 3 pin wire into the BMW aux and route it to the front of the car..... I was hoping to see if any of the electronics shops had something for a zune.. some shops are saying they will have some by this summer.... I guess Ipods rule the world... talk about a monoply