What do i need to make my car louder?

okay i have a T2-1000.1 total mobile amp by jl audio and two mtx 5500 in a custom box behind my back seat in my avalanche. It hits hard but i got use to it now and want to upgrade to two 12's and i want something were i can feel the difference not just a little. I am looking at some jl audio w3v3 12's does anyone know if those will hit harded then the mtx i have now to the point that i will be satisified? and whats are some other good 12's at a good price that can get the job done?