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11 After our upgrades were complete, we saw power numbers increase 10 percent across the board. Torque and horsepower improved at every rpm, and our 383 was now up to 245.44 horsepower and 315.73 lb-ft of torque at the rear wheels. The comparison graph clearly shows that both torque and horsepower improved at every rpm. Driving the Newport, the car definitely pulls better from an idle all the way through the rpm range of the engine.