Inline that (Jacuzzi wj) is a decent jet and can ,with a little work provide good performance and reliabilty We have a Miller 18 running 80 mph with a slightly modified WJ and BBC There also "Energizer kits available to you as well. What would be helpfull here is a little more info on you boat ! What were you WOT rpms vs speed ,how big is the boat and how was it loaded when you tested it Tom