DC Level 5 15 box (air space/port?)

[mmets]

Currently have two Level 5 15s. Each is being ran off a 5k at 1 ohm. When I made the box I was going to run to XL's but changed my mind and ended up with the level 5s. Box currently works but I am pretty sure I can get a little more out the these. I know they recommend 3.75 each. What do you guys recommend on airspace and what should I be shooting for on my port, how many square inches etc.

They are in a trailblazer right now and will be for a while. May do the box before summer hits so I can get to some shows or comps out here. Thanks.

[Neckbeard]

8 cubes net,14Sq inches for the port, sub up port back in a SUV. Should sound damn good

[mmets]

Subs are up and port will be back. 14 sq per foot so total of 112 sq inches of port is what I'm guessing.

[mmets]

Any other thoughts

[ChevyBoy95]

7-8 cubes, subs up, port to the rear hatch at the bottom, ~120 sq in of port, tuned to the mid 30s.

[john253a]

7-8 net 190sq" of port at 35-37hz

[mmets]

Thanks for the input guys. I guess I will be doing close to the same box with port area. The box I have now has 45's inside so doesnt have the airspace. Guess I'll do another one but take the 45's out and do a little more bracing. Thanks.