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I have a deposit for my Promax from a man who plans to put it on a 16' Grew tunnel. I never knew there was such a thing?

Full tunnel or center pod? What sort of prop should he run? I was going to offer a Hoss copy that I've never used. But if that's not a good choice, I can tell him to shop elsewhere.

This is the only size Grew tunnel I recall they made......with a Promax on one he is going to get wet.
https://www.kijiji.ca/v-powerboat-motor ... nFlag=true

I had talked to the guy who owns the boat in the link you posted Don. He still gets sprayed over the bow even with the 10" setback and the 90hp. Boat has a bad porpoise as it wont trap enough air. The tips of the tunnels are also too low in my opinion on those hulls. They catch a lot of water from the tips back into where the forks end

ProMax + Grew Cat = Not a really good idea