Was just at a stereo shop and placed this box behind the passenger seat, It fit perfect with the loss of only about 2 inches of travel. It's shaped like a wedge with 5" at the bottom and 3" on top so when placed down at the floor the headrest was only about 2" from the firewall. Its a sealed box with a slim Rockford 10" in it. They wouldn't allow me to hook it up and they had none in the demo room but they assured me it will pound in a Fiero. So I ask has anyone heard this box in action?

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https://www.fiero.nl/forum/Forum1/HTML/087461.html

I heard it in mine a couple years back at cartoys. it was a demo and i wasnt impressed. Im not saying it was bad but it wasnt the most amazing. The sound that comes from a sub doesnt come from a sub, it comes from the box it is in. those slim boxes arent very good at producing bass. I built a box and put it under my dash in my passenger floor board. It doesnt leave a ton of leg room but I dont care because I never sit over there lol. Plus it sounds much better.

I will answer my own question. I installed it on Friday and its better then I thought it would be. I highly recommend this subwoofer for anyone looking to add bass to their system.