I am attempting to upgrade my system from baseline (1 CD/Tape) to Mach 460 in my 2002 Mustang - I have the head unit. Has anyone done this? If so I realize I will need to purchase the amps/speakers, etc. I have been told that the wiring that goes from the front amp to the back is already in the car - does anyone know if this is the case? It is my impression that I will need wiring from head unit to front amp - the other wiring from front amp back is in the car - and I will need complete rear soundboard. I will also need front speakers and tweeters - is the wiring already there? Any suggestions (with the exception of - you should have gone aftermarket