I have two walmart cheapie subs under my seat. I made the boxes out of MDF in woodshop class (I got an "A" on it so dont laugh
). In my opinion, they are way too small for the subs. I think they came out to like less than 1/3 of a cubic foot and i really needed about 3/4 of a cubic foot of space for these subs. I cant remember though. They dont sound that bad. And yes they do give you quite a butt massage when you turn them up
Now that they are painted black, and the console is color matched to the dash, to someone who doesnt know anything about these trucks, it almost looks factory. I mounted an amplifier under there too.