help choosing box!

[chevyboy95]

i have a 2007 gmc 1500 crewcab. its also the classic body style. i am stuck on which box to use in this truck for my 2 12's so i wanted to get yalls opinon on 3 different style of boxes.
should i get a box that goes behind the back seat, a downfiring, or upfiring box under the backseat? what are the pros an cons of these these boxs? all help will greatly be apprciated!

[cshaw07]

cant ya just make one? not sure of the differences, but all id make sure to do is keep it hidden and out of the way

[01xtreme]

Are you using shallow 12's? If not, I don't really see you putting a box under the rear seat or behind it without modifying the seat brackets.

[chevyboy95]

yeah i plan on using some shallow mount 12's