I finally got it all figured out. Port is 2.75x13.5 = 37in port area. The box is 30 wide, 15 tall, and 16.5 deep. 2.49 cubes after displacement tuned to 32-33Hz. I'm running a single kicker 12" VT from my S-10 build I had a few years back. Not bad for a shallow mount sub. Definitely a huge improvement over a .5 cu ft sealed truck box.