I am thinking about making one more box for my 15in XXX, i want to make one that occupies my whole trunk, in order for me to fit a really big box in there, i will have to have the sub face up, becuase i need to clear a lip that is 13.5 inches high, bc i will be taking out my back seat to get this in there, then i will put the back seat in to place after i get it in there, i was thinkign about having the sub face up, with port facing either back or front, if anyone can help, ask what you need to know and ill try to help you in the best way possible from here on, i have a 99 2 door grand prix gt, here it is http://www.cardomain.com/id/xxxwangs