I have and54 reg Uly Eleganza. I want to put in a decent stereo setup (amp, bass, speaker replacements and the like). However i'm not sure whether to connect a system up to the connect nav+ (with screen) system i have or to strip it out and start over. Would i lose all the on board computer info if i took the original unit out? Where do i find an adaptor for the 20 pin iso plug? Lots of questions i have! Please HELP!!:slayer: