I am guessing the only thing you can take out would be the antenna. I dont no much about the factory install but i think in the later years of the MCS they had it able to have a SAT option for radio so you could control the sat radio on the MCS, if that is true then the radio code stays with the MCS so you cant transfer the service to your car. My guess is if you wanted factory sat radio the dealer has to do some activation with the computer.
The unit is in the rear right quarter panel where the CD changer mounts ...
I have the MB Install bulletin for 04-05 MLs ... actually I have all of them for 04-05 MB models. Provide me with an e-mail address that can accept file sizes larger than 1MB and I will send it to you ...
Paul[:D]
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01 ML-320 -- M1 Luxury Package, M2 Convenience Package, BoseĀ® Premium Audio w/integrated 6-disc CD-changer and Bose sail-panel tweeter add-on, OEM 3rd Row Seat Package, OEM DVD navigation, OEM MB V60 integrated cell phone upgraded to a non-Mercedes Motorola V551 using the Mix-Box 100 Interface, Voice Control, OEM vehicle entertainment system with OEM VCP, OEM DVD player, and OEM wireless headphones, OEM Style 1 chrome brushguard with skidplate, OEM Style 1 chrome sidesteps, OEM fender flares, OEM rear mudflaps, OEM PIAA (959) fog lamps & matching H3 PIAA Crystal-Ion integrated fog beams, OEM trailer hitch with (modified) Bully stainless steel hitch step, Schatz oval exhaust tip, Schatz chrome a/c rings, OEM AMG chrome cluster rings, and some esoteric stuff you will probably never notice ... but I know it's there.