ported box for 2 brahmas

[plyhammer 10+ year member]

I can squeeze out about 4.02^3 of space for my box for 2 brahma 12" subs. Is this enough space for a ported box? Should I go sealed? The box is of a downfiring design for under the rear seat of my quad cab truck. If porting works, what type of port and which direction to fir the ports? Thanks

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