ported or vented/ slotted question

i think this may be one of the first times i posted so try not to jump my case to fast. anyways, i am making a box for a power acoustik fubr 15" sub. it has a port specification but not a vented or slotted and i would rather use a slotted or vented style for my box. is there a way to convert the specs? any ideas? FUBR-15 2000 watts power handling 800 Watts RMS 200 oz. magnet size 2.5” ASV voice coil SPL 93 dB Fs: 29.1 Hz Vas: 4.73 cu.ft. Qms: 3.83 Qes: 0.457 Qts: 0.4986 Xmax: 0.6" Sealed box: 2 cu. Ft. Ported box: 3 cu.. Ft. Tuning: 35 Hz Port Size: 4”(dia)x6.25”(length) # of ports:1

There are very few people who will flame you on this site, so welcome as well and post away. There are alot of good members on this site that will help you out when available. Dyohn has sent you on the right track.Top Secret, I can tell you but then my wife will kill me.