I currently have a carpc in my 330xi with NAV (couple of years now) and plan in installing one in the X3. On the 330xi I used a BMW modified video module. Space appears to be tighter for installation of Video module. I use CarX in the 330Xi (doesn't have all of the bells and whistles but it does the job). I have all of the pieces except for video module. Anyone install a CarPC with NAV on an X3 yet? Does Sirius talk on the IBUS?