Replace the faulty or old stock catalytic converter with the all new aFe power direct-fit cat replacement. This cat replacement is constructed of mandrel-bent, 100% MIG welded stainless steel for strength and durability. This unit comes with a 49-State federal approved cat and 3/8" thick flanges for a secure hassle-free installation. This cat replacement is designed as a one piece system that retains the factory O2 sensor and hanger locations for a direct bolt-on and go solution. Stainless Steel Construction: This system is constructed of durable mandrel bent stainless steel tubing for maximum performance, corrosion resistance and strength, eliminating cracking. Factory Mounting Locations: Utilizes factory mounting locations and factory style flanges making it a true bolt-on system. Catalytic Converter: This kit comes with a 49-State federal approved catalytic converter for a bolt-on and go installation. aFe POWER Direct Fit 409 Stainless Steel Rear Passenger Catalytic Converter Toyota FJ Cruiser 07-14/4Runner 03-18 V6-4.0L Toyota FJ Cruiser 07-14/4Runner 03-18 V6-4.0L