Originally Posted by Bimmer360

You will need the following:

16:9 screen monitor
MK4 DVD Computer
Radito Tuner BM53
Nav Harness
GPS Antenna

I have done the retrofitting myself on my e46 but my X comes with it already. You're looking at about more than $2K to spend. OEM setup IMO is better and doesnt look awkward in your dash but just limited in features.