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After giving the 5.0-liter a little cool down time, Schmidt pulled the 4.38-inch pulley and installed the smaller 4.25-inch replacement. The smaller pulley produced about another half pound of boost, bringing the total pressure to 7.5 psi. With the car back at operating temperature, the '11 spun the rollers to 543 rwhp with 429 lb-ft of torque. An extra 19 rwhp from a half-pound of boost is a great gain!