Can't believe I haven't seen this thread before.
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Sorry for the terrible quality picture, best I could do with my cell phone in the garage right now. It's ugly, but it can hit anything down to 10hz. Which is pretty impressive considering I'm working with less than .75 cubit ft of airspace per 12" woofer. I cannibalized an existing box from SuperCrew Sound that I had laying around for test fitting purposes, wanted to make something I could mount securely without making any holes in the rear of the cab. Always planned on taking it back out and making something cleaner, but it sounded so good I never really felt like going to the effort. Please don't mind the awful cable management and T-tap... Like I said, it's just temporarily permanent!
2X Rockford Fosgate Punch 3 shallow mount subs powered by a 90's Lanzar OptiDrive 2500, wired 4 ohm mono @ roughly 1000W RMS. The Lanzar is the real beast of the setup. It will drive the hell out of anything but it runs HOT and draws a ton of amperage. Whenever I re-do it I'll probably look for something a little more practical, sadly.