Right now, I have a Sundown Audio SA-8 on 500 watts and it's awesome. It really came alive when I put it in a .85 cubic foot box tuned to 34 hz (used to have it in a .56 cube box). Right now its firing forward into the passenger seat with a 4" pvc port coming out the side. Its awesome but some say a downfiring box would be even louder? Is it worth it to try? I mean I am happy with it right now but the more bass the better.