[sastanley]

I don't think it will solve, but it should help. I have the same problem in my Catalina 30..the 'dry stack' puts the manifold exit just barely up from horizontal where the water is injected. Although the metal is sound, I took it off since I'll be replacing all of the soft hose in the system, and had some between the injection point and muffler. I am considering re-designing this as well, but knowing about the possibility of water backing into the system will likely remind me to close the thru-hull if it doesn't start up easily.