The factory-rated 385 horsepower is rated at the crankshaft. All of our numbers are rated at the tires after losses through the drivetrain, with some amount of variability between dynos. 5-Star's stock dyno run showed the truck making 290 horsepower and 290lb-ft of torque at the tires. Their run with the Boss Package and a 93-octane tune produced just over 325 horsepower and 310lb-ft of torque at their peaks, which is a gain of 35 horsepower and 20lb-ft of torque over stock at the tires.