Modifying the seats to fold down, requires different hardware. There are two BIG Torx bolts holding our seats in place on each end of it. Once that is removed, simply lifting it up and snapping it off is required. If you want to do this mod, find a Wrecked Tour and take all the components apart, because there is a safety issue involved here. The fold downs have a reinforced metal strip, that prevents things from invading the passenger compartment, and they need different specail hinges back there.. Go find a wrecked car and take it all apart..
P.S. while you are back there, try a deck mounted port enclosed Sub.. Just a though ton that one, I'm working on one here along with finding a rear seat also.
