that rule there big is something someone started to sway them to go with there design lmao. really bro subs up in those big ass caddy's an box chevy's wang just as hard as sub an port back.
but i am gonna aggeree with taylorfade up there. sub up port to the sid should work ok. if not you can turn the box an do sub up port to the back lol. its just something thats gotta be tested. oh an get some fatmat or something for that deck lid cause its gonna sound shitty without it.