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Headers: 1 5/8-inch vs. 1 7/8- to 2 1/8-inch Stepped Race Headers - With the intake side improved, we turned our attention to the exhaust. Mihovetz had a set of 1 7/8- to 2 1/8-inch step headers for his old supercharged race motor, which were installed in order to improve the flow rate of the exhaust system. The headers offered a significant power jump, upping the peak power from 800 hp at 6,500 rpm to 852 hp at 6,800 rpm. The peak torque was up to 740 lb-ft at 5,300 rpm. Note that we were now running to 6,900 rpm.