Went ahead and bought the impeller and gaskets yesterday to change my water pump on 2007 Mercury 90 hp 2 stroke. Now mind you it has never given me a lick of problems and the old one didn't appear to have thing wrong with it but after the change and water testing it at the boat ramp, WOW! That sucker was peeing a stream twice as strong at idle than it ever did full throttle! Wasn't a big deal to change it as I have changed it before on a Merc. 40 hp but pretty amazed at the difference in performance.