This is a direct fit replacement Catalytic Converter. MANDREL BENT TUBING , NO crimped or wrinkled tubing. 409SS tubing and flex connector, INNER LINED flex connector for long life. developed FROM OEM sample ensure proper fitment. NO comparison to any competitor's product. Large amount of precious metals insures long life and performance ! 3 bolt inlet flange and 3 bolt outlet flange has provisions to mount factory O2 sensor, sensor not included