Factory recommendations:

Acceptable:

0.4 - 0.95 cu ft net volume sealed

0.3 - 1.2 cu ft net volume vented, Fb = 22 - 36 Hz

Optimal Car:

0.65 cu ft net volume sealed

0.45 cu ft net volume vented, Fb = 27 Hz

I notice that the optimal vented box is smaller than the optimal sealed. I was thinking going sealed b/c of space issues but if going ported will really be smaller should I do this. Im also thinking aero ports and need some information on how to calculate what size I would need to tune to 27 hz. Does anyone own an rl-i if so what kind of box is it in?

LOL, for around 20sqin of port you would need a port near 170" long.

Trey, as I mention to many other people, what I usually try is optimal sealed box designs first. Mess with adding some polyfill stuffing to find the sound you want. Then if the output is lacking for your needs, look towards ported. There are plenty of drivers I have kept sealed.