I would have them downfiring if you could and get 4 12" JL Audio w-3's!

 

10's will most likely sound cleaner, plus they use less airspace which is key for a truck box. 12's will hit harder though

 

do you have a regular cab or a extended cab? I no that sierraon22s has four 12s under his rear seat

 

when i get my truck, im thinking about putting in two 10'' kicker solo-baric L7's which are in the cab that are hitting against the front seats. They hit pretty hard and have good sound quality

 

i have a 01 extended cab. i know that downfiring them would sound the best, but i need to have to have them forward. im also going to run kickers and im taking out the back seat.

 

kickers downfiring? I've never heard of them sounding good that way... but my vote goes for the 12s. I've had 10 L7s and 12 L7s and 15 L7s, and i can't say i've been impressed by the 10s at all. I love my 12s :ninja:

 

I would go with 12L7's they are a great sub. I installed 2 of them in a camaro and hit 141 and I had really bad voltage drop at the time so i don't know what it would hit now. Anyway they are one of the best subs on the market

 

Am I too late?

I have 4 12's underneath my back seat w/out moving the seat. I would personally go w/ 4 12" L7's. If your gonna remove your back seat your best bet would be to go w/ the 12's cuz you'll eventually get tired of the 10's cuz they wont live up to your expectations.
I plan on getting 4 12" L7's in the future but I'm gonna keep the back seat cuz I need it. :naughty: