2 SoundQubed HDS3.1 15 box design

[treyS3469]

So I bought 2 SoundQubed HDS3.1 15s its a upgrade from Kicker CVX 12s but I can’t complain about them they were good to me but like always we want to get louder and I would use my old box but it got wet  and swelled up so I’m looking for some help again the last box I got from here SLAMMED!! I would appreciate the help but this time I might have to build inside my trunk I have sound deadened the trunk along with the rear deck so the port and subs are firing into the cabin it’s sealed of okay but not 100% and it is a 2017 Ford Fusion I’ve also acquired a Rockford Fosgate DSR1 but I mostly listen to rap/hip hop little bit of alternative and country from time to time so my max dimensions are 

H:17.5”     W:39”    D:24”