I hit a 151.2 @ 57 hz using a pair of TR7512´s and a Cadence C6 @ 1 ohm , subs forward/port back , it was 2 6" aeros and i used 1.5 cubic feet per sub, i fucking love those subs!!
I would build 2 cubic feet per sub and 2 6" aeros, i tried a few port areas on that burp box and that was the best i could find, once again, they are great subs!!
About the L7´s , they sound good, but i prefer the cvx´s , plays a lot nicer on music if you ask me...