Race catalytic converter 100cell FIA conical connections 90 degree Inner diameter 1 (mm): 63 Straight reducers Inner diameter 1 (mm): 63 mm Inner diameter 2 (mm): 32 mm Inner diameter 1 (inch): 2 1 2 inch Inner diameter 2 (inch): 1 1 4 inch Length: 100 mm Color: Black Wall thickness: 5 mm Temperature range: 40 to +180 degreeC Outer diameter 1: 73 mm Outer diameter 2: 42 mm Reinforcement: 4 layers Material: High quality silicone rubber polyester fabric This BigPack replaces everything between the turbo outlet and the throttle body O2 sensor bung: M18x1 The catalytic converter are sold with SBF FIA approval document for use with engines up to 4000cc