I will go on a limb and guess with the equipment you have, as I have a CVX 12 D2 off of 750.1 Autotek with the big 3 done and 0/1g Kicker hyperflex wire, but mine is in a 1.5 sealed box. Just perfer sealed myself. I am hitting close to 140dbs. Is louder to the ear anyway than my FI Q and that did 138.4 off my buddy's TL. This is in a trunked car, sub facing back.
I say you should be close to 142 if not louder with that setup. Only way to truely know though is to go and get metered, prefebly by a TL.
Good luck and nice stuff.