Thanks for the Info LIRS6. Started to do some searching and found that TeddyBgame seems to be the Navigation Guru. As a matter of fact he had a C5 RS6. My only issue will be if the Extension cable will plug into the Kenwood Unit. I went to my local dealer to check out the Kenwood DNX9960 NAV unit, and all I can say is that this unit in phenomenal. The display and Navigational Graphics are the best I've seen outside of the Portable units. The Quality of the construction seems to be Top Notch also. And its very customizable, all colors can be set to match your cars interior. A built in DSP also allows you to shape the sound to your cars interior. A very good unit indeed.......