The Mercruiser Mercury Marine BBC Boat Exhaust Rear 861229-C is an aluminum Alpha Y pipe designed for inboard engines and components. Made by the reputable brand MerCruiser, this rear exhaust system ensures optimal performance and durability for marine vessels. With the high-quality materials and expert craftsmanship, this product is a reliable choice for boat enthusiasts looking to upgrade or replace their exhaust system for a smooth and efficient boating experience.