ok, first off i drive a 90 camaro, and wanted to do something cool with my box, besides just building a rectangular box and sticking it in my hatch<---plus it looks horrible. I couldn't put the subs in the dip cause of lack of airspace, so i desiged this one, the subs will hit against my back glass, and the part where the amp is will go over my back seats (folded down)....the only thing about it i don't like is i'm afraid it'll hit too low, and won't give me enough punchy bass, for those fast beats (i listen to rap, rock).i built a 3.5cuft box for my friends 12" comp and it hit deep but sounded bad on not so deep, punchier bass beats.....if i add enough bracing to take it down to around 4 cubes won't that make it punchier, and hit low??if i do add bracing to take the net vol. from 5.7 cubes to around 4 won't i have to change the port specs??