The Chevrolet And GMC 2001 Through 2001 Exhaust Manifold Kit is a reliable and durable solution for replacing the stock manifold on specified vehicles. Made with cast iron construction material and featuring an irregular exhaust manifold inlet port shape, this kit ensures a precise fit and long-lasting performance. The 5mm tube wall thickness and included heat shield provide added durability and protection. With all necessary gaskets and downpipe hardware included, this kit offers a complete repair solution. It fits most Chevrolet and GMC C3500HD 2001-2002 models with V8 496CID 8.1L engines and is a direct OE replacement for General Motors 12557283.