Ok so I started to build a box for my 2004 Chevy ext cab for a single 10". The sub is a custom built (splaudio) sub and I was told 1.3-1.5 cuft. Well I actually have 1.75! That's before any displacements. Sub is around .1 I was gonna port with PVC but now I am thinking of building a square port just to use up some space. Anyone have any ideas? Here's a couple pics of the unfinished box. I'm at a hold point. Lol.