Box is built for IASCA Stock 3. All in the cargo area, back seats can move back and tilt back at least one click, and subs surround comes up to 24.75" out of a possible 25" to stay in the class. Equipment is 8 Ascendant Audio Chaos 15s (my old subs) on 2 Sundown 3000Ds (my old amps). Box is ported, but too airspace and port are too small. Box is tuned at 30hz. Whole box is 1.5" thick. Single battery in the back powering both amps, always shut off on most burps, so horrible voltage. Still jams out some tunes though. Didnt have enough space to go port back or get a big enough port... So whatever. Sounds good playing some music.