Shawn is, as usual, exactly right. Make your exhaust system as good as it can be within the design limitations of the Catalina 30 and the rest is up to you, how you operate your engine. Your own practices are the real risk.
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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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