Hello! I JUST traded my piece of junk Mitsubishi eclipse spyder in for a 2007 #2 touring magnetic gray prius on saturday, and I absolutely love it! I'm a little bummed though... I was under the impression it came with NAV, but it didn't. is there a way to add it? It also looked like under the CD player a compatrment with an extra slot, almost like you could add another CD changer. (or DVD player!) is any of this possible? or is it just completely out of the question? Thanks!