I have the Soundlinq SLI installed in both my Camry & Prius both of which have the NAV system. If ever I had to have work done on the NAV system, it would be fairly easy to pull the SLI out. The only drawbacks to the SLI is that it only works if you have playlists set up on your Ipod, you can only control the Ipod through through the car's controls (the SLI locks out the controls on the Ipod) and in the Camry, due to limitations in the Camry's radio, you only get limited information on the screen. (in the Prius you can get all the available information.) We are going to have the Sirius Satellite package installed in the Camry when it is available sometime in May. Hopefully the factory Sirius won't plug into the same port used by the SLI.