O yea so about the problem that we have now. When were were listening to the subs they sounded fine. Then we cranked it up and it sounded like shit. My first reaction was that the amp was clipping. Then when i walked to the back i noticed flex we were getting from the roof. I got on top and tried to hold the roof from flexing so much. And sure enough the flex of the roof was cause. So now were looking at three options. a. We sound dampen the shit out the roof. B.) we brace it. or C.) we fiberglass to help stiffen things up.