If not trolling, this community will recommend doing anything but pre-built boxes. A good ported box (assuming you have the room) is always better than a pre-fab not designed for the sub and vehicle it is to be installed in.
Kicker recommends 2.25 cu. ft. per sub ported after displacement. Having considerable experience with Kicker subs myself, I'd say do 3.5 cu. ft. per sub after displacement if you have the room. Do decent port area (65 sq. in. each in separate chambers or 130 sq. in. in a shared chamber) and tune to 34-38.
^what he said. I had my CVR 12s in a rather large box, cant remember the exact measurements but somewhere around the above recommended air space, with three 4" aero ports and they got darn loud, and low