I know there have been a few threads about this, but I was at the dealer today, and the tech said that there was "no way" of retrofitting the Nav system. Anyone have experience with this? I also wanted to add bluetooth at some point.

go visit http://navplus.us for information on retrofitting a navplus unit including bluetooth. Next time use the search button please.

But yeah, people have found a way to install the NAV+ and also finally retrofit the bluetooth, isn't exactly cheap.