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13. Back on the chassis dyno, the Livernois tune and the CORSA exhaust combined for a best 372.98-rwhp output, with 427.14 lb-ft of torque. That's a 25 percent gain in horsepower and 21 percent more torque, when compared to the stock configuration of our SuperCrew 4x4 project vehicle. For the money—just under $2,000, including installation charges—the package represents great bang for the buck.