Well i just took out two cerwin vegas 15's from my trunk...too heavy and i needed space back...i just bought two infinity kappa perfect 12's for now and i need to find someone who could possibly come up with some designs for a box...I can build it i just need some specs and all. I was thinking about having a sub on each side slanted and an amp rack in the middle but i suck at design so if any of you guys have some ideas lemme know...thanks