GM announced on September 30 that the redesigned Duramax 6.6L V-8 turbo-diesel offered on the 2017 Silverado HD and the 2017 Sierra HD.This next-generation redesign offers more horsepower and torque than ever, an SAE-certified 445 horsepower (332 kW) and 910 lb.-ft. (1,234 Nm) to enable easier, more confident hauling and trailering.Along with a 19 percent increase in max torque over the current...