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.Product Details Manufacturer part number: 93320A13 For use on select V6 and V8 MerCruiser sterndrive and inboard engines Provides 3" 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 RISER KIT-3 INCH