I just put a Kicker original sub box with a 12" Kicker Solobaric L7 and it fits and sound great! The box is 16" high, 18 3/4" wide and 18" at the bottom, 14 11/16" at the top deep. I put it in with the sub firing into the back of the cab and the slanted back fits up against the back of the seat perfectly. I can still put my seat all the way back but I can't recline it all the way (doesn't bother me because I have no need to recline it anyway) I'm very happy with the way it fits and man does that L7 pound! I'll try to get some pics of it in the truck if you would like. I highly recomend it!

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My baby: 08 rc/sb TRD 4x4 SR5 Tundra with the 5.7 in pull me over red

still can't get the stupid grin off my face
Previous trucks:
81 1-ton Chevy 7.4
89 Full size Blazer 5.7
00 1500 Sierra 5.3
00 1500 Silverado 6.0
01 2500 Silverado D-max LB7
02 2500 Sierra D-max LB7
05 1500 Silverado 5.3
07 2500 Sierra D-max LMM- traded for the Tundra