What is the easiest way to run some wires from the passenger area to the trunk on a spyder?

Wiring a sub or something, Tmann?  The best and most discrete way is to go under the carpet near the door sills.  Then when you reach the rear seats, the wires should fit under there unless it's too thick of a gauge.  It might stick out a little if it's too thick.  To get to under the carpet, just remove the door sills.  There should be only a couple of screws or tabs holding it in place.