Reading the first post my thoughts went immediately to Dave's solution. Modifying the MMI system to reach the existing hose will buy you some time as will splicing in a short hose to reach but someday the entire hose will need to be replaced. What are you going to do then?
A variation to Dave's advice is you can pretty easily modify the transom attachment with a stainless doughnut plate. The ID has to fit the exhaust hose clamp, the OD has to be a little larger than the hole in the transom after you've enlarged the transom hole to extract the thru-hull with the hose and clamp attached, approximately the same size as the ID of the new doughnut. In use you'll fasten the thru-hull to the doughnut, attach the new hose to the thru-hull with the clamp (2 clamps?), slide the entire assembly through the transom from the outside and fasten the doughnut to the transom with caulking and sheet metal screws. For a nice yacht quality finish the doughnut must be polished to a bright mirror finish.
If you have adventure in your heart and your marriage can survive it, tell the wife you're sure there's a smallish honey at the local nudie bar who would do it for a price. Of course remind the wife you asked her first. Fair is fair.
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Neil
1977 Catalina 30
San Pedro, California
prior boats 1987 Westsail 32, 1970 Catalina 22
Had my hands in a few others
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