yeah i agree. could be the same size, just made to fit better in the truck and have the port designed into it. not sure how deep the subs are, but the port could come out the top of it. or on each side. up to you if you wanna give it a shot. but if you're afraid of messing up the box, then you may wanna leave it sealed. also...while some subs can be put in ported and sealed boxes, some are only recommended for sealed and some are recommended for ported. so possibly his subs might be better off in the sealed box