stero ssystem setup

i have a 90 cogar in great shape, i waont to put subs behind the rear seat i know that you can out them in the trunck, but that not what i want to do.

i want to pull the back seat out a put them there facing the front of the car, after looking at it i noticed that there are metal arms crosing the back are these just to suport the seat or suport the car?

my goal is to have a system that is not seen. the only thing that you can see is that the trunck is a little smaller. :cool:

i want to say they suport the fram for the unabody but im not possitive. this is a tough question. because i never heard of anybody cutting that out of any type of car unless they were modified the complete car reinforcing the hole car (for ex.a racecar) in your case if i cut that out i would reinforce a fram around what you cut.kinda like a carpender putting in a header or a fram around a door or window