I too wanted a subwoofer but didn't want to loose precious trunk space. I looked into the Jeep brand underseat sub boxes but felt that they would be too weak (80 watts) and with only 6.5" driver, their frequency range would be limited.
I made custom sub enclosures for under the front seats out of fiberglass and mdf, which utilize the 8" shallow mount pioneer subs. They ended up being around .35 cu/ft each, which is right in the middle of the recomended volume range listed by pioneer. I have yet to decide whether I am going to paint them or cloth cover them.
I think they came out pretty nice, here's what I did in case anybody wants to try it also:
I got 2 large plastic bags, shoved each one under the front seats (at their lowest position). I then inflated them with compressed air and sprayed 2 part "A/B" insulation foam into each of the inflated bags. When the foam hardened, about 1 minute later, I lifted the unbolted seat up and removed the molded foam form.
I then trimmed the foam forms with a serrated knife and used them as molds to fiberglass. Once the first few layers of fiberglass cured, I removed the foam, I reinforced the fiberglass shell on the inside. I used a piece of MDF for the tops of the enclosures so it was relatively easy to fiberglass. I then traced the tops of the fiberglass shells onto the MDF, cut out the shapes and used a rabbeting bit on the router around the edges to create a strong epoxied joint between the fiberglass shell and the MDF.
I also had to make custom subwoofer grilles out of stainless steel brake lines and steel rings cut to size on a lathe.
I will post some pictures of the enclosures and all aforementioned components in their current state.
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