2 DB drive WDX 18" subs need help with the enclosure

[Pink Noise]

Hey guys ive got a pair of the DB drive WDX 18's

im gonna be building a wall in my 2003 Lancer however im wondering if anyone can help me with the enclosure.

so far the dimensions i would like to work with are .

40x36x22

would this be sufficient.?.

im looking forward to hitting some great SPL figures and dont two ports removable for the purpose of playing audio as well as SPL burping.

Would the dimensions be sufficient for the subs to get me somewhere

or would the box need to be bigger.

so far ive come up with 126sq inches of port area 15" long this should be tuned to about 45-47hz sumwhere around their.

would this be fine.?. for 1 sub woofer.?

any assistance would be very helpful thank you

[Pink Noise]

anybody .??