17380-ZW9-020 Muffler Plate - Overview. The 17380-ZW9-020 Muffler Plate is a genuine Honda OEM part that plays a critical role within the exhaust system of Honda marine engines. This component serves as a protective plate specifically for the muffler, helping to shield nearby components and surfaces from the heat and debris generated by the exhaust system. Designed to meet factory specifications, the muffler plate ensures seamless integration with existing hardware, maintaining the engine's opti