Generally there is an elbow just after the heat exchanger with water injection to cool the exhaust gasses and then a heat resistant exhaust hose to the through hull. Sometimes there is a water lift muffler in the middle to reduce noise and sometimes a water separator to discharge the water and exhaust separately to reduce noise. The water injection should be lower than the top of the elbow so it doesn't put water back into the exhaust manifold, but it needs to be high enough in the elbow to allow mixing with the hot exhaust to cool it enough to prevent burning through the exhaust hose attached somewhere below the top of the elbow. My guess is that the heat exchanger and exhaust elbow are two inch and the through hull is 2 5/8 and the elbow that you speak of was used as a transition point. My thoughts are that bigger is better. I'd go to the larger size for the entire run to decrease back pressure on the exhaust. Twenty feet is a long run for an exhaust hose of only two inches. **************One site has it all. Your email accounts, your social networks, and the things you love. Try the new AOL.com today!(http://pr.atwola.com/promoclk/100000075x1212962939x1200825291/aol?redir=http://www.aol.com/?optin=new-dp %26icid=aolcom40vanity%26ncid=emlcntaolcom00000001)
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