Whether or not a particular exhaust style will work for your boat is dependent on relative elevations of the engine exhaust outlet, available space for a generaous hot section rise and downhill run from the top of the rise to the exhaust thru-hull presumably at the transom at even keel AND heeled under sail. Just because Moyer offers a straight pipe system does not mean it will work for your application.
Studying the Grampian 30 drawings online it appears to me there is enough rise available for a standpipe system on the port side under the cockpit seat. If it were mine that's exactly what I would do. Did we determine your Grampian was a 30?
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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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