Ya that's the thing, i don't exactly know all the ways to determine my space and my box and stuff. Guess ill do some research first, but yeah spacei s limited in my accord sedan. But i don't mind throwing some in my back seat with the seat down (lol). And i only mentioned money is not an issue so i would get more ideas from people. I put about 1.2k in my system i have now basically, and i wouldnt mind spending the same for the next step up if possible. These 2 12s i have right now flex my whole roof and flex's my front windshield decent, but i'm ready to step up to some crazy stuff lol. So i was guessing maybe 2 15"s would be the best in my view not sure though. Ill look up on the box dimensions and all that after work and add that in. thanks for the quick replies + welcomes.