UcrewX5, I have completed the navigation retrofit this weekend. I found that the 06 X5 has a lot of unfore seen surprises. but it workes great. A few items that I founds was , 1. The retro fit wiring harness only have ONE phone mute wire but 2 is needed so you must pick this wire (white/green) up athe phone module and run it to the radio. 2. The New harness does not have wires for the CD player so you must run these. You must us a old style to new style antenna adaptor. If your x5 has bmw assist...well now it gets fun because the bmw assist uses a GPS antenna and there is no where to mount the new one. You must modify the under the spoiler (cut, drill). I wanted to have the cd option at a later date so for my Ipod I ran video for movies and I split the audio, one for the AUX input on the radio and other for movies. Total time about 14 hrs..