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Hello Robin. My name is Tan.
Yes in salt water applications.
The exhaust system has a life in saltwater applications. The risers are good for about 350-400 hours or 3.5 to 4 years of age. The manifolds are good for 500-600 hours of use or 5 to 6 years of age or which ever comes first for both.
Now the cost of the parts seem awful extreme. Could I get the engine serial number and I can get you a price of these parts.
Ok. Salt water is very corrosive and then add heat.