I let you see what I want you to see, sorry. The outside was epoxied then herculined, still going to add one more large layer, great stuff man, really. This stuff is so good you can brush it on, I am gonna even brush all the metal in my trunk, it cannot hurt. I was doing some vibration tests and in a decent thickness it has dampening qualities. The stuff inside is acoustical dampening material but does not go anywhere near the port area. This is designed to break up any reflected coloration and standing waves. The stiffness and shortness of the material (1/4") will not cause much if any turbulance and if it does it will be outweighed by the increase in sound quality. The box has strategically placed 1" hardwood dowel braces, only two as not to add to any more turbulance, should sound nice.... Polo.