i've had the ef fairmont for 3 months and it is time to upgrade the stereo.it has the standard 6 disc in the boot. my question is can i run an amp off the standard head unit or will i have to change to a unit with rca preout. also the disc stacker reminds me of a pioneer one i had. were these made by pioneer for ford? any help would be great cause i don't want to throw stuff away that still works well.