The all-new Mack Keystone™ was engineered to deliver the power, durability and quality customers expect from Mack. With an evolved MP13 engine producing up to 540 horsepower and 1,950 lb.-ft. of torque, seamless MP13 and mDRIVE™ integration, an all-galvanized steel cab and a more capable frame system, Keystone is built for demanding service on and off the highway. From endurance testing to high-stress frame analysis, every detail was designed with performance, reliability and real-world work in mind. Learn More: macktrucks.com/trucks/keystone Build Yours: macktrucks.com/trucks/keystone/build #MackKeystone #HeavyDuty #OffRoad #Highway