Actually, I'm looking to hook it up on it's own. I have a slightly upgraded factory system (VW Monsoon) which includes an amp. I realize it's not as good as a set of aftermarket speakers and amp, but it sounds better than I thought it would so I'm giving it a shot. The only reason I would keep my factory head unit is if I can get both it and the Empeg to work. I just don't want to give up my radio. I have to get my talk-radio fix every now and then.