Replace your faulty catalytic converter with aFe POWER's direct-fit catalytic converter. 100% hand MIG-welded, mandrel bent, 409 stainless steel tubing for strength and durability, this affordable, direct-fit converter is EPA compliant and utilizes factory mounting locations, OE style flanges and includes quality hardware for a quick, bolt-on install. This direct-fit catalytic converter replacement is constructed of 100% hand MIG-welded, mandrel bent, 409 stainless steel tubing for strength and durability. aFe POWER Direct Fit 409 Stainless Steel Catalytic Converter BMW Z4 M Roadster (E85) 05-08 / Z4 M Coupe (E86) 06-08 L6-3.2L (S54) BMW Z4 M Roadster (E85) 05-08/Z4 M Coupe (E86) 06-08 L6-3.2L (S54)