I am wanting to add an amp and subs to the cargo area. Does anybody know if there is good way to hook it into the factory stereo since it doesn't seem to be a typical stereo? One method I could probably do is tap into the rear speakers to feed the the sub and amp, which would of course mean that the subs would be on the rear channel. Does anybody know if the C-Max has an additional factory amp located someplace else in the car to power the speakers? I have the basic C-Max package. Any help would be great.