Most serious Sea-Doo tuners already have a nozzle on their craft. Because of this, there is less space to fill before water exits the pump, allowing a higher water velocity to be maintained. This is a big bonus in rough water, where there is a noticeable improvement in acceleration. He can easily change when the shift occurs depending on the length of the straights. Sea-Doo recommends a specific clearance between the end of the impeller shaft and the bearing cover cap.
Proper installation requires some measuring and shimming.