EPA OBDII COMPLIANT - This catalytic converter is designed to meet or exceed Federal EPA (Environmental Protection Agency) OBDII emissions requirements in compliance with legal standards for federally registered vehicles. NOT for use in California or Colorado. Specifically designed for the 2011-2016 Chevrolet Silverado 2500 HD, 2011-2016 GMC Sierra 2500 HD, and additional vehicles KEEP THE CHECK ENGINE LIGHT OFF - This MagnaFlow OEM grade catalytic converter has been engineered to satisfy the vehicle computer control monitoring requirements for the specific applications listed. Such exacting standards keep the check engine light off while guaranteeing reliable long-term performance STAINLESS STEEL CONSTRUCTION - The utilization of highly corrosion resistant stainless-steel construction, free-flowing mandrel bent pipes and MagnaFlow’s cutting-edge CNC precision robotic manufacturing techniques ensure consistently perfect fitment, reliable performance and superior longevity 5 YEAR / 50,000-MILE LIMITED WARRANTY - Worry-free ownership is made possible thanks to the 5 year/50,000-mile construction and 25,000-mile emissions warranty included with this MagnaFlow catalytic converter DIRECT-FIT - The direct-fit configuration of this catalytic converter allows it to function as a bolt-on replacement, enabling hassle-free installation. MagnaFlow utilizes state-of-the-art 3D scanning technology during the research and development process to ensure that this new converter will fit and function exactly like the original equipment. Necessary installation hardware and/or gaskets are included