Its going into a ford f150. I was going to have both the sub and port firing forward on the 13X16 side. You are right about the port dimensions not lining up I have been playing around with different dimensions and posted the wrong dimensions. So the port will be the width of the internal volume of and 1.5 inches of airspace tall and then route that through the box in an "L" shape until it is 1.5 inches from the bottom of the box is that correct? How long would the port be then? Is that a good setup. I do have a little area to play with. The max size I posted was Ideal but I could go a few inches bigger just cant do any more than the 16 inches. I am removing the rear center console and replacing it with my sub. I wanted it to be when the seats are folded down the seats would be flush with the top of the box but I could fudge it a little. Thanks again.