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Headers and a larger cat were the first changes for the Camaro this month. We chose Edelbrocks emissions-legal headers that include the smaller 2-1/4-inch lead-down pipe to the catalytic converter. Edelbrock also makes a larger system for the H.O. engines using a 3-inch lead-down pipe. To make this system breathe, we also installed a 3-inch DynoMax catalytic converter.