Retrofitting OEM NAV is not cost effective. HVAC, wiring, all sorts of things are different. This is one of the main reasons we walked away from 40 AE's when shopping.
We thought NAV finishes the dash vs. the 'option you didn't get' look of the cubby.
Time/money/labor spent on trying to do it...you are better off getting a car with NAV. Yeah, sucks for AE's in the US but its just one color option: there are others that are still great
- b