so ur saying something like this would hook up to wherer my back speakers cords are cord for cord or is there some technical stuff that has to be done? and wat type of amp would i be looking for?

Parts-Express.com:Eminence Alpha-10A 10" Guitar/PA Driver | alpha-10a guitar speaker pa driver keyboard speaker 150 watt driver
but i would need to make a box for them??? or can i just attatch them to the backs of my seat and drill them in?