Well when I got this car it came with the Scion Navigation System (sns) which was sweet at the time. The system is sweet but it has no pre amp plugs and according to the dealership can only handle up to 160 watts. So now I have money to get a good sound system but I never thought this through. Is there a way to go around this and get good quality out of my speakers and still put subs and a amp. in? If so how? or should I get a new headunit with the navigation all over again and hook up the speakers, sub, and amp. that way?