Subwoofer
#2
probably not because there isnt an existing amp in the 2012 that can power it if it just has wires for sound going into the box but if you have both power and sound going into the box you are going to have to find out wich fuse is for remote turn on. (usually is going to say in the manual "accessory relay" or something like that) and run power and a line out converter to the box but even then you might have problems fitting it in the spot since its so cramped in the back but hope that helps