Exhaust elbow 864591T02 is for use on V6 and V8 MerCruiser sterndrive engines made by General Motors with dry joint exhaust manifold (model year 2004 and newer, serial No. 0W310000 and up). It also fits GM made, V8 MerCruiser inboard engines (model year 2002 and newer, serial No. 0M317000 and up). It has a 4" outside diameter and a 14 degree down angle outlet. For corrosion protection it is hot dipped and powder coated. The Quicksilver brand is the leader in delivering uncompromising engine oils, parts and accessories to the marine industry for over 65 years. Quicksilver is the premier supplier of Mercury Marine original Equipment replacement engine parts, oils, and accessories, but also works to serve all original Equipment brands in the marine and powersports industries. It has earned a loyal following by providing the highest quality products that are tested through some of the most rigorous environments and testing procedures. No aftermarket company comes close to the level of research and design as Quicksilver; buying Quicksilver is buying performance, protection and peace of mind.