Box Size input please

[Techt0nix]

this is going in a 2002 cavalier 2 door would you wall it off behide the doors or would you just build the box speced for the subs witch i think is 6cubic feet per sub but im not sure this is going in the back seat and i thought the walled box would sound better b/c the less cab space but may be to much cubic feet for the subs and make it sound worse but im not sure thats why im asking you all for some help once again

Edit: subs are 2 15" memphis M3MOJOS powered by a 2500.1 memphis mojo amp

[jmitch]

can u fit it in the trunk if so put it in the trunk if not do a halfwall thats just me cuz 2 subs in a wall dont look right to me!!

[Techt0nix]

can u fit it in the trunk if so put it in the trunk if not do a halfwall thats just me cuz 2 subs in a wall dont look right to me!!

not going for looks just sound and no cant fit anything in the trunk car has airride and a 12 gallon airtank is back there takes all my room lol