Quote Originally Posted by scooz14 View Post
iirc you can use the pre-outs on your after market head unit to control the factory amp.

i have never actually tried, but i remember reading that somewhere.
dunno. probably depends on the factory amp in the car. bose amp, perhaps that's possible-- but you'd have to convert to bare wire to go into the amp anyway. if it's the delco, that one uses speaker level inputs.