So, went and played around on a Term Lab this afternoon and here's some results:
Windshield 40 hz: 139.4 dB
Windshield 24 hz: 138.8 dB
Kick panel 40 hz: 139.6 dB
Kick panel 23 hz: 139.5 dB
So far i'm very impressed at the low end these things have. Still want a better score so i'm going to build another box (maybe have this one subs behind drivers seat and port firing passenger side toward the top of the box instead of toward the bottom like this box was). I would like some input thought on box designs (volume, tuning, port area). I would like to put up a 142 or over, but still be able to play most music and not be a burp box. However, i do LOOOOVE the lows that this thing produces.