So I spent the last couple of days sound proofing the Max. What a difference it has made. But while spending time crawling under the dash I noticed that there were several unused plugs behind the climate control unit and the radio. Could Canadian spec Maximas be pre-wired for Navigation?

 

Can't speak for Canada, but my understanding after much reading is that the NAV vehicles have a nav-specific harness.

If you search and read, you'll quickly come to the conclusion that a nav swap-in is a great deal of work for less than current GPS capability results.