I am looking to do the same thing wanting to know if you run into problems with anything. I have read in crutchfield that due to some makes we may lose some of the features like date and time on the hud unit and stuff like that.

Was wondering if your going to be running headrest dvd to. For an extra 300 i was thinking of doing it to the car. or running wires just to monitors in the back seat from the hu.