4cuft tuned to 31hz 6" aero port. I can't even get a hair trick. And a shirt trick is hard but will still work. I'm only running 4 gauge back to both amps. Maybe a lot of resistance? I'm gonna fix my grounds then run 2/0 back. Maybe I need some deadener? My ports are facing foward. Should I flare one side? They're external ports by the way.