someone's gotta know this. I have a sealed, dual sub setup with them firing backwards. I plan on making a new box, and I was just wondering, how tight should the box fit in the trunk? I had heard that there should be a decent sized gap to stop spl buildup in the trunk and to allow the pressure to more freely enter the cabin area. With my setup, I'll only be hitting at most mid-130's, so there won't be any extreme pressure, but with about 3 to 4 inches on each side of my current box my trunk already rattles pretty badly. Any suggestions on how much of a gap should be left?