So, I just got a double cab tundra, and had a tacoma before. I have a smaller sealed encloser with a FI "Q" 12" sub. Running off a 1200 watt jbl monoblock. It hits pretty hard, but I am wondering if I can do better, with an enclosure that fits under the back seats, or something. The box I have will need to be sat on the floor, behind my passenger seat, witht the rear seat folded up.

behind the passenger seat? idk the space that is located behind the dcs.. I know it isn't much at all since they were initially bolted to the rear wall.. If you measure out the space and draw something up in paint I can design something in sketchup and look at some options