Hey guys, just whipped up this design for dual 15" subwoofers walled in at the c pillar.

Thoughts?

-I got a little confused with my design in terms of where the port ends and where the box volume starts.
-I measured the port length through the middle of the port and stopped it 3 3/8ths up from the bottom because I figured the port would end on the diagonal from the back left corner to the end of the inside of the port.

Also, what I was considering was just adding more bracers on the inside to eat up a little more of the volume.

Port:

Slot port tuned to 32Hz with 8 ft. ^ 3 volume showed:
103.25 in. ^ 2 port area (current area: 213 in. ^ 2)

Port width of 35.5 inches and height of 6 inches showed:
40.27 inch port length (current length: 44.758 inches)


Volume:

Inside height: 21.75 inches
Inside depth: 19 inches
Inside width: 35.5 inches
Inside bracer: Two 21.75 inch 2x4's
Inside bracer: Two 6 inch 2x4's
Inside volume: 9.15 cubic feet (not counting woofer displacement)