if you run into problems with teh room for bigger subs,what kinda are you looking at.cuz if you look at subs made for sealed boxes i don't care if you put in a 18 you have room.put if you are looking porting you will be having problems.some of the top subs on teh market for ported boxes will take up more room then you can ever make in our cars.

i might be drunk right now so that is why imisspelled shit.or i just can't spell