This exhaust manifold was precision-engineered and durably manufactured to match the fit and function of the original manifold on specified vehicles. It includes all necessary gaskets and downpipe hardware for a complete repair. This part is compatible with the following vehicles. Before purchasing, enter your vehicle trim in the garage tool to confirm fitment. [Chevrolet C4500 Kodiak: 2003, 2004, 2005, 2006] - [Chevrolet C5500 Kodiak: 2003, 2004, 2005, 2006] - [Chevrolet C6500 Kodiak: 2004, 2005] - [Chevrolet C7500 Kodiak: 2004, 2005] - [Chevrolet C8500 Kodiak: 2004, 2005, 2006, 2007, 2008, 2009] - [Chevrolet C8500: 2004, 2005, 2007, 2008, 2009] - [Chevrolet Kodiak C8500: 2004, 2005, 2006, 2007, 2008, 2009] - [GMC C4500 Topkick: 2003, 2004, 2005, 2006] - [GMC C5500 Topkick: 2003, 2004, 2005, 2006] - [GMC C6500 Topkick: 2004, 2005, 2006] - [GMC C7500 Topkick: 2004, 2005, 2006] - [GMC C8500 Topkick: 2004, 2005, 2006, 2007, 2008, 2009] - [GMC Topkick C8500: 2004, 2005, 2006, 2007, 2008, 2009]