18110-ZVT-405ZA Exhaust *NH8* Manifold - Overview. The 18110-ZVT-405ZA Exhaust *NH8* Manifold is an essential component of Honda marine engine systems. It collects exhaust gases from the cylinders and directs them efficiently into the exhaust system of Honda outboard motors. Designed for durability and performance, this manifold features a distinctive *NH8* dark gray finish, ensuring seamless integration with existing parts, maintaining optimal performance and durability.. Key Features. Original