Box help

[ant the ninja]

So my boy just bought an 01 f150 ext cab and two sundown e8 v.2's. He doesnt have much room to work with because it has to fit under his backseat, I dont have the dims right now but Ill have them tomorrow at some point. I was just wondering, should he do ported or sealed? I know those babys like to be ported so I figured we will go with that, just wanted to get some input on it.

and if anyone happens to want to help me design a box for them please let me know, I could use all the help I could get, first time building a box here.

Thanks