Skar evl dual 4 vc 2 15s box build

[oldmanboom]

Hi all im trying to find information on building a ported box for 2 skar 15 inch dv 4 ohm subs tuned to 31 hz. I have plenty of room for the box in my my 2003 ford expidition 3rd row folded down running an extra battery and a 320 alt with 3 amplifiers total power around 5k rms watts. all skar speakers doors subs.Wonderring if anyone out there has built a nice ported sub enclosure with subs firing up and port to the rear and if you could possibly share box design details are anything that would be helpfull.I have the tools required for the job but ive only built sealed boxes back in the day 1990s for punch and kicker. thank you for taking the time to read this and any help is welcome.