Keep the check engine light off with MagnaFlow California Grade CARB Compliant Direct-Fit Catalytic Converter 5582706. 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 specifically for the 2004 Ford F-150. Hardware is included to eliminate the hassle of working with corroded factory parts. This replacement part is designed to meet or exceed California Air Resource Board requirements and has undergone additional testing to comply with CARB guidelines to allow for legal use in California and CARB restricted states for the listed vehicles.