I have a older honda 9.9 that has a 9.5X9.5 prop that has a shot bushing, it does exhaust through the prop. I can't seem to see that size available anywhere. The boat is a 28 Alumaweld Jet that seems to have a hull speed of about 5.5kts, or at least that is about the max the kicker will push it. If anybody has any thoughts on a new prop size and any advantage of going to a four blade it would be appreciated. Honda parts here are non existent, so if anybody has a favorite source it would sure be nice.