infinity kappa 12 ported box design

I currently have 4 Infinity Perfect 12's in a sealed box and am looking to change that to a ported setup. I am aware that this will take up a considerable amount more space, and I am okay with that. However, I would prefer to find ways to keep this enclosure as small as I can. (This is going into a Ford Explorer) I am interested in purely SQ. What size box and frequency should I be going after here? I am new to the design stage of box building, but I was able to find the following specs from Crutchfield: Vas (liters): 83.28 Fs (Hz): 23.32 Qts: .44 Xmax (mm): 14.15 Thanks for all of your help. Evan

I've gotten some direction to have 1.75 cubic feet per driver tuned to 32hz. Would that perform well or would a different configuration work better?