I want to add a little more thump to my system by adding a 8" subwoofer and maybe a 200W mono amp. I was thinking of mounting a free air one on the left side side panel (where the power antenna would be if I had one!) using a piece of MDF for support. The whole idea is not to take up any of what little trunk space there is in our cars. I'm guessing a shallow mount sub might fit the bill as there is only about 5" of depth available and I reckon there may be enough volume there to make it work. What do you gurus think, is it doable? Colin