My friend has a 98 Mustang Gt, With two tens in a sealed box in the trunk. He wants more power basically, I was wandering is there a better setup for a trunk, or is it that he needs better subs, and amplifier or just upgrade to 12s. I know every once and awhile someone asks the same basic question which is better sealed, ported , or bandpass. Well for the specific application any help would be aprreciated.