Help with ported box design please

[bass4dayz]

I need help with a ported box design for a Sundown Audio E-12 v2 to be put in a 2005 Honda Civic VP. I don't care for trunk space, just want to feel the nice low notes by giving this sub a proper box. I'm in San Diego if there's any local box builders near me.

[Joe X]

Here is a suggestion, sub /port firing back, power: to sub rated, amp subsonic filter to 28Hz, minimum port clearance 2 1/4", figure is just an assembly guide:

NOTE: If building outside you need to build a cardboard dummy box to test fit in it's way inside.