Hey guys. Picked up this RE SX 18" today for $160. Never been installed or powered (not even holes in the surround where the screws go!)

I'm wondering what the optimal box for low end output will be for this sub. I'm thinking 28-30hz tuning for decaf.

I believe my usable cargo area with seats up is 38x18x24 with almost no window loss.

If that is not enough, I can un-latch the seats and let the back of the seats sit vertical (right now they are slanted back a bit)