Not sure of the exact port measurement, but its tuned to 33 HZ.
It moves a ton of air! Has definitely brought out all the rattles I never knew could exist. I sound deadened as much of the car as I could, clv, ccf, mlv etc. My sunroof being a weak link as I could not fully gain access for more deadener, I did what I could. I'm sure being upfiring subs plays a part in that.
I metered 143db with a single Xcon 15" on 1400rms, cannot imagine what I'll be with two 15' on 1000rms each. Definitely more than I will ever need. These Xcon's are my holy grail subs, no desire to upgrade from these ever. The be all, end all for me.