Don Stocks has a Catamaran with 2 x Yanmar 3GMD 30 Hp Diesel engines. It’s a heavy Cat and needs all the grunt from the Yanmars to do 7 knots.
Trouble is, he has Vetus plastic mufflers fitted that are delivering virtually nil noise attenuation. We manufactured Don some replacement fibreglass models, here is what he reports back….
Fitting was a bit tight with the slightly larger diameter, but we managed ok. Very significant difference in exhaust note, very quiet. After removing the Vetus mufflers could see no baffles, they were virtually straight through. Very happy with the decision to make the change.