and the TV tuner has the rear camera input, so yes, you can have 16:9 monitor up-front, and the TV tuner in the back and no navigation. you still need the wiring from the back of the car to the front. there is a Nav retrofit factory instructions out there, i saw it but don't remember where... do a google search...

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E53 X5 4.6iS
147K mi - Sold May 2013
Tireprints left in:
USA, Nicaragua, Costa Rica, Panama, Russia

E53 X5 4.8iS built 2005-10-17
66200 mi - June 2012
96000 mi - June 2013
112000 mi - June 2014
OEM fire extinguisher
OE first aid kit
OE tow hitch
OE TV module
OE aspheric mirror
K&N air filter
black/white badges
rear camera
4-channel video recorder

Here is the list of things I have done to the X