Proper heat management from the cooling system is crucial on modified engines when you want trouble - free and reliable performance. The factory Duramax water pump is known to slip under load and can serious problems and serious repair bills on modified high - horsepower applications. This updated design is a drop - in replacement for the factory water pump and uses precision TIG welds to secure the pump gear to the shaft.If your 2006 - 2016 Duramax powered truck is running a tuner, a bigger turbo, or bigger injectors, or if it's just time for routine maintenance, get peace of mind with the Sinister Diesel Welded Duramax Water Pump., IncludesSinister Diesel Welded Water Pump, O - ring, Thermostat Gasket.