No the nav wiring has been put in the car with the nav and they will not include that stuff for a future install. Nor would it be worth it to install it now. If you even did have enough money to do such an upgrade it would not be worth it as you would also have to install the crappy bose system for the nav to work as well as find somehow to have a antenna for the nav. It would be 100 times batter and more worth it to just get an aftermarket one. The aftermarket head units can be controlled threw the steering wheel controls.
Their are to many things that you would have to do to even think of upgrading to the stock nav system.
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