Box for 2 12 inch massive kilo subs

[Thursty2018]

I currently have one massive kilo 12 in a custom made ported box im going to be going with 2 subs and I want to build a box for them I can build the box no problem but I need someone to help me with the design. The box I have now is 2.34 cubes tuned to 32hz and the sub sounds amazing in it very loud and gets down low I would like to try and keep the same sound and lows but with 2 subs instead of 1 I will be running them on a sundown audio sub 2000.1 at 1 ohm