No, I went a whole different route. Being I don’t have any space to build a box, and my buddy’s shop is busy building ****... I can’t get access to a table saw and time.
What I did was buy the factory subwoofer from the 10” HK system. Matched a locker amp, modded the factory box, and installed. No, it’s not 2 12’s thumping, but it does add a sweet Lower end... Enough to where the lady asks to have it turned down. So, I’m happy for now. I may get wild and build a box in my drive way when warm weather comes, or install a box if they come down in price. The amp I picked has the power the factory sub needs at 5.4 ohms. (Over 200 watts) but at 1 ohm the amp can push 800 plus. Enough for one maybe two. Future proof.