MagnaFlow OEM Grade Federal/EPA Compliant Direct-Fit Catalytic Converter 49531 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. Designed to fit the 2001-2004 Nissan Pathfinder and 2002-2003 INFINITI QX4 this direct-fit catalytic converter also interchanges with OE parts 14006-4W001 and 20020-5W000 among others. Avoid potential exhaust leaks by using the included gaskets to get a proper seal. 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.