Now available in sizes to fit all 1 1/2" and 1 5/8" exhausts. Manufactured from thick, pliable copper with a raised compression ring to maintain improved sealing. This is your answer to leaking exhaust flanges on just about any set of stock or custom cylinder heads. Copper Exhaust Gaskets are a must when running fuel injection or a turbo. All Copper Exhaust Gaskets have a crush-ring, to help ensure a tight fit.