4th order bandpass ideas

[Daboxxstl]

I have a digital designs 2515 I wan to bandpass in the back of my 1991 Honda civic hatch. I want to stay below window line and behind the rear seat. I have about 5.2 cubic feet to work with. I was thinking about 1.18 sealed and 3.95 ported. The ported tuned to like 55hz. Throw out ideas because this is my first time building a bandpass