No longer do racers have to choose between making power or being emissions-compliant. Kooks Headers & Exhaust has developed an all-new line of Green Catalytic Converters that meets EPA guidelines and still delivers the raw power that Kooks fans have come to know and love. Kooks new cats eliminate emissions-related check engine lights with a 90-percent success rate, and meet all federal EPA standards. Universal to all Kooks systems and with both 2.5-inch and 3-inch sizes available, the new Green Cats work on applications up to 900 horsepower, handle exhaust temperatures up to 1,500 F, and are ideal for naturally aspirated as well as turbocharged or supercharged applications.