past EURO3,4,5,CARB,used for gasoline car, three-way catalytic converter Catalytic converter emission standard , you can choose EURO2,3,4,5 EPA,CARB Size , follow your demand of diameter and length purify the exhaust of CO,HC,NOx from internal engine of gasoline car character : Lower burning temperature: CO: ≤241°C HC: ≤246°C NO2: ≤264°C Higher conversion efficiency: CO: ≥96% HC: ≥95% NO2: ≥90% ...