Exhaust riser kit 93320A13 is for use on MerCruiser V6 TBI sterndrive engines with 2-piece exhaust manifolds (serial No. 0M614999 and below). Will also fit on MerCruiser sterndrive and inboard tow sports V8 engines with 305, 350, 377, 454 and 502 CID with cast iron exhaust manifold elbows (serial No. 0M299999 and below), MerCruiser V8 carbureted engines with 305 and 350 CID (serial No. 0M300000-0M599999) and MerCruiser inboard and tow sports carbureted engines (serial No. 0M300000-0M316999). See your owner's manual or service manual for specific application and instructions.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.Key Features For use on select V6 and V8 MerCruiser sterndrive and inboard engines Provides 3 in. of rise to the exhaust manifolds for optimal exhaust system installation and proper engine operation See your owner's manual or service manual for specific applications and instructions Fitment / ApplicationFits MCM V-6 carb & TBI engines with 2 piece exhaust manifolds (s/n 0M614999 & below). Fits MCM/MIE/Tow Sports V-8 (305, 350, 377, 454 & 502 cid) engines with cast iron elbows (s/n 0M299999 & below); MCM V-8 (305 & 350 cid) carb engines (s/n 0M300000-0M599999) and MIE & Tow Sports carb engines (s/n 0M300000-0M316999).