if you replace your Bose speakers, but I decided to just run an aftermarket amp for all the aftermarket speakers. I had to run wires from the doors to the rear of the car where the amp was, but it's worth it in order to get a great sound imo. I personally had the Pioneer AVH-P5700DVD (which has a nav option), and it was well worth the few hundred dollars it costs for touch-screen dvd and navi.