does anyone have an idea as to what it takes to upgrade from an 03 command system to the new 04' command with the dvd navigation? do I need to add a navigation system in the back above the cd changer? I saw an 04 head unit and it says it's plug and play but I don't see a slot for the dvd in the dash so I'm assuming that I need a nav system in the back??

 

do a search in this and the CL55 forum (type DVD). i heard it is a pain/not worth it.