I also have 2 10" behind the seat, picked up my box at Circut City for around 100 bucks... under the seat is where the amps, CD Changer, and Electronic Crossovers, go . Just be sure when you are sub shopping that you get the type designed for the shallow box, I have Kicker Pro Comps, they work great.
i built my own boxes out of 5/8 particle board and 23/32 plywood. and put 2 12" mtx thunder 6,000's in them under each rear seat with a kenwood 600 watt amp. i can take pics if anyone wants to see them. i just did it 3-4 weeks ago and i havent covered them with fabric yet.
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