Hi iam new to the forum and would appreciate as much help as possible. Right now I have one dd3510 in a box built to spec from the dd website running off a d1500.2 in a Toyota tundra. It plays great but I want to have a SPL box also. I was thinking about a 1.25^3 with some aeroports run under the passenger seat. I would like to know how long the ports should, how many ports , what size and if the ports can be mounted on the bottom of the box? I have some room for change but would like to get around 145.