My current ported box has an internal volume of 0.97cf. I cant go any larger as I have a Jeep YJ and just don't have the room with my off-road tool kit that I have to keep in the Jeep. The sub wants 1.5cf to play optimally. Can polyfill help me here? I know some love it and some hate it. I was looking more at doing the 2" poly sheeting and just gluing it to the inside box walls while leaving the slotted port open as to not affect porting and to allow good airflow for cooling. Your thoughts? Thanks