I just bought a 2003 Ford Expedition Eddie Bauer edition that's got every option. I want to keep my Navi and Rear DVD system but want to upgrade all the speakers and add the amps and subs I currently have at home. I also have a factory 6 disc cd changer that I can give up or keep. Bascially I don't know what my options are but I def don't want to give up my Navi or DVD but want everything else upgraded so what kind of equipment do I need to buy in order to do this?
