Stealth Sub Placement

[vimnjicki]

I've been looking all over the car (08 3dr hatch) to place a pair of subs that will be big enough to provide serious thump without taking all my spare tire space or "trunk" space. Looked at some 6.5 inch subs to be placed under the front of the rear seats. Looked under the front passenger seat. Looking at the space under the side rear windows, under the stock speaker positions. That last one has me thinking. Custom, I know. but has anyone tried it? I was thinking a pair of 8 inch subs in MDF bonded to the upper plastic portion and covered with acoustically transparent material. I havent removed the side panels yet to see how much space there is, i.e., cubic feet, but I think it could work. Just bouncing around ideas here.