I have a 2006 X-2 w/MCX and typically run with quite a few people in the boat, often times with the Fly-High kit full. I contacted Eric @ OJ and he recommended the 14.75 x 15.5 XMP Edge. After about 30 hours with the new prop I would HIGHLY RECOMMEND this upgrade! The boat pulls much harder out of the hole and through mid range. The boat only lost about 1mph top end. Contact Eric @
ejojprop@aol.com he is great to work with.