Ok, I have an '02 police trep that is badASS, save the stereo. I'm convinced they put in .50c speakers lol. I have the head unit that has a tape deck and CD changer controls. Do I need to upgrade the HU or the speakers to get decent sound? Or both (dont say both LOL). All I want is something equal to a "good" factory car stereo...I'm by no means an audiophile...lets face it..country music and alternative rock doesnt really require the thump that rap does.