I'd like to get XM radio in my wife's Cayenne. Any suggestions for a clean installation?

 

I have it in my Cayenne TT. I have the new Delphi unit, its a bit smaller then the first model. It is mounted in the sunglass holder and playes through an FM modulater. You have to trim the lower lip of the sunglass holder so you can access the bottom row of presets, but other then that it is an easy install. You can still close the holder once you set the station or turn it off. The antenna is mounted in the center of the windshield tight to the glass. The whole thing works great. BTW, I first had a Pioneer unit. It quit working after a few weeks and Pioneer couldn't/wouldn't fix it so my steareo dealer put the Delphi unit in its place. It is easier to use then the Pioneer.