I am currently working to see what all needs to be performed to make this a possibility, inserting the A5 card simply is not enough. I do believe the cars without Nav, did ship with all essential hardware (global positioning module) due to observation, if you click on the INFORMATION quadrant on the MLT, then select the button that says WHERE AM I? There is no map, obviously, but it does give you your exact longitude and latitude, and also changes as you drive. Give me a week or so to play with this and see what I can come up with (which modules need reprogrammed, flashed, etc....) I will report back with news either way. I know many that have a vehicle that was purchased without it would like to be able to add it later, or at least know that it could be if desired.