MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 21-252 helps keep the check engine light off. DIY installation is easy with the proper tools (no cutting or welding required). With features including mandrel-bent tubing to eliminate flow restrictions and stainless steel construction to resist corrosion, you can have confidence in the quality of this catalytic converter. Using state-of-the-art 3D scanning systems in the design process, the MagnaFlow metrology department ensures this new part to fit and function like the original equipment. This direct-fit catalytic converter is designed to fit the 2011-2016 Chevrolet Silverado 2500 HD, 2011-2016 GMC Sierra 2500 HD, and additional vehicles. Hardware is included to eliminate the hassle of working with corroded factory parts. This replacement part is designed to meet or exceed Federal emissions requirements set forth by the EPA, complying with legal standards for OBDII Federally registered vehicles with California or Federal/EPA Emission systems. Direct Fit Catalytic Converter; OEM Grade Series; 3.5in Tubing; 3in Inlet/Outlet; 2 Converters; Overall L-62.75in.; O2 Sensor Location Pre/Post Converter; Not Air Tube Adaptable; MagnaFlow specializes in superior catalytic converter and exhaust technology and each converter is designed to the exact original equipment specifications while keeping the Check Engine Light off.