Hey im trying to make an enclosure for my 13w7 and im wondering if anyone has any ideas on how much airspace they would do and what you would tune the port to? I have looked at jl audio's spec on the woofer and i had a box made which im currently using and i know it can hit harder.

What i have to work with:

I would like the box to be 40"-42" long X 15"-21" wide and the height can 15"-17".

I want the sub to be facing up so in the vertical position and the port either on the side or faceing back
(does anyone have any opinions on which way i should face the port?)