Ive been havnign the same problem in my sol. I have heard that you can make a custom box to sit behind the seats. That is really the only way to go. My neigbhor said he'd build me one here in a few weeks. If he does and it works well, I'll see how much he would want to build another one. As far as keeping them in the trunk- No matter what you do it'll never sound as good as it would in a fulll size box. I ended up buying 2 truck boxes that are only about 6" deep, and putting my 12's facing upward. But, theirs a freakin firewall between the trunk and the inside of the car, and it really kills your sound
