enclousure

So According to Skar I need 3.75 c/ft. each sub and that's 7.5 c/ft. for both. The sub displacement is .875 each so 1.75 for both. So 9.25 c/ft. box, am I correct? I am also looking for 32 / 33hz. I have a box design of : 38w x 26d x 16h = 9.15 c/ft. Now I need a port. Can someone help me...