Break out your wallet if you want factory nav... many have asked the same question and the same price keeps popping up... TOO MUCH!
The reason the factory nav costs so much is like one poster mentioned (new harnesses, nav unit, center dash and etc...) what you dont know is that through the factory nav I can control most features on the car such as auto diming, speed volume, door locks, wiper sensors and a whole slew of other things. This is why its sooo expensive!
Best bet get an aftermarket unit add an extra screen with a car computer and be done... maybe add a ps3 with wifi or something
