I have a 2012 Silverado Crew Cab, with limited space under the seat, and don't want to raise the seat. I found a pre-made box that basically represents how much space I have to work with, and it just so happens to have measurements with it. 51" wide, 17 3/4" deep, 9 1/8" high in front, 5 1/8" high in back. http://www.audioenhancers.com/vehiclespecific/crew180.php I also saw this box, and got an idea. http://subthump.com/Chevrolet-GMC-Sub-Boxes/Silverado-Sierra-Crew-Cab/07-Up-New-Body-Style-GM-Crew-Cab-Quad-8-Front-Fire-Box.html If I took the measurements of the first box and built a box for two forward firing SA8 V2's using 3/4" MDF, is there an aeroport configuration ported out the front of the enclosure that would work to get it into the 30-35hz range? The width of the box can conceivably be reduced if need be, and if that were the case, one could conceivably port out the side, if there is enough space. Thanks in advance