Help deciding on sub

[x133rx]

I am about to purchase a new flush mount box for my 2013 mustang. Unfortunately the largest I can get the box that fits in my trunk is 2.5 cubic feet. I know for a fact I either want an AA Havoc, or SSA Xcon, now which one would function best in a box that small port tuned to 30hz?

[Skullz]

Same manufacturer so it really doesn't matter which one you choose as long as your happy with the purchase.