This exhaust manifold is designed for use with Yanmar inboard engines. It is a genuine Yanmar part with the manufacturer part number Exhaust manifold. The item does not come with a warranty.The Exhaust manifold is a crucial component for any boat owner with a Yanmar inboard engine. It is made from high-quality materials and is designed to last for many years. This product is perfect for those who want to upgrade their boat's exhaust system or replace a damaged part.