Sports catalyst for increased power and torque. Made of stainless steel. The catalyst does not perform the exhaust gas cleaning function. It has a hole for screwing the probe in. Dimensions: internal diameter output: 57mm internal diameter input: 48mm (the design provides for the possibility of spreading / sawing it up to 57mm) length: 40.5cm Designed for: Honda Civic CRX Del Sol 1988-91 D-Series D15 D16 EX DX LX SI Honda Civic D-Series 1992-95 D15 D16 EX DX LX SI Honda Civic D-Series 1996-00 D15 D16 EX DX LX SI The product is not road approved. It is designed for use in motorsports, tuning exhibitions and more. Sports catalytic converter to increase power and torque. Made of stainless steel. The catalyst does not perform the exhaust gas cleaning function. It has a hole for screwing in the probe Dimensions: internal diameter output: 57mm internal diameter input: 48mm (the design provides for the possibility of spreading / sawing it up to 57mm) length: 40.5cm Designed for: Honda Civic CRX Del Sol 1988-91 D-Series D15 D16 EX DX LX SI Honda Civic D-Series 1992-95 D15 D16 EX DX LX SI Honda Civic D-Series 1996-00 D15 D16 EX DX LX SI