the first thing you will need to determine is what iDrive you have if you want to use that. i have an LCI CCC touring and installed a backup camera. the CCC equipped vehicles require a much more expensive video interface for a backup camera than the CIC equipped vehicles. there are several threads out there to help you once you figure out which iDrive you have. 2008 was a switch over year, so depending on when the vehicle was manufactured can determine the iDrive.
G~