Need help on new box.Currently have 2 15 mtx 9500s. Working in a trunk with max dimensions of 54x17x24 Should I get 2 more subs and make a sealed box, ported box with 4 15s which wont be hardly any room for them, or keep the 2 and make a ported box with about 7-8 cubes for both combined. saz3500 amp,240 alt,5 bat,all 0 gauge. What will be loudest and sound the best. Thanks I just dont know much about boxes except they are very important in a systems performance.