okay, so i have a question regarding the replacement of the factory stereo in my 200QT. what i would like to know is, do i need a wiring harness to install an aftermaket stereo? i know i have the bose stereo with the amplified speakers, do the speakers require anything special? can i just throw in a new head unit and go? or do i need somehting with the ability to power the speakers? if i were to put in a small subwoofer, what would you recommend for an amp?