sub placement question

[collin.k]

Well im building a new box for my car (vw golf) and im wondering what the best placement is. I want to wall off behind the backseat, and have the port above the top of the rear seats, with plexi on the back of the box facing the rear hatch, so i can some LEDs in there and still (maybe) use the rear view mirror. my question is, whats the most efficent/loudest orrientation for the subs and port?subs back port forward, subs forward port back, or both sub and port forward or backwards?
oh yeah and does anybody want to work with me on a design for said box?

[Qexler]

Port rear and sub rear is usually loudest in most applications, I have found that you can get by with sub up and port rear and it still sound pretty good.