Go directly to the man that knows, Eric Johnson @ http://www.ojprops.com/contact_us
or contact him by pm, EJ OJPROP, http://www.mastercraft.com/teamtalk/member.php?u=1537
Be prepared to give him any info he may need like, current prop info off the hub, the current altitude you use the boat at, baseline numbers of the speeds and RPM's for the current prop, boat model and year, engine size, transmission ratio, function (skiing, barefooting, surfing, boarding, tubing, etc.), ballast use, fuel load, gear, nominal # of passengers, etc. He will need it to determine the best prop for your
Charter Member Number 1
At some point in time people need to wake up, remove their cranial intrusion into their own rectal areas, and take responsibility for their own actions.