Help, my son bought enclosed Kicker subs (DCVR12) for his '95 Chevy Beretta and they are just a bit too big to fit into the trunk. There's enough space for them to sit in there, just having a problem getting them in. We're about 2 inches too big in all directions. We removed the back seat, no luck. Can we modify the box without affecting the subs? Any help/comments would be greatly appreciated!