Stainless Steel Sport Catalyst with Metal Insert for maximum 1200-2500 cm3 CarsCatalysts are available in various cell densities.400 CPSi catalysts are typically used in gasoline production cars, 200 CPSi in diesel engines, while 100-200 CPSi sport catalysts are better for sports or tuned cars for optimal exhaust gas flow.CPSi - cells per square inch: cell density in the catalyst.We offer both ceramic and metal insert catalysts. The metal insert has higher heat resistance, withstanding up to 1300°C, while ceramic can withstand up to 850°C. Metal inserts are generally more expensive.Dimensions:Diameter: 50mmLength: 385mmWidth: 170mm  Height: 83mmEmission Standards:DIESELEURO 1: 07/1992EURO 2: 01/1996EURO 3: 01/2000EURO 4: 09/2005EURO 5: 2009-2014GASOLINEEURO 1: 07/1992EURO 2: 01/1996EURO 3: 01/2000EURO 4: 01/2005EURO 5: 2009-2014