memphis mojo's would hit way harder but needs serious power. mtx 8000series or higher. alphasonik 800 or 900 series, diamond d3 or higher, re audio xxx, eclipse, ect..
not to mention....your box is about half the size it should be....should be like 8 cubes....and your ports are WAYYYYY to small....i'd go around 240 sq in of port for 2 12"s. Long story short....i can take lesser subs and get more SPL out of them with less power, your box sucks