With some 5.9L Cummins 12 Valve trucks, the factory heater grid is removed in favor of a higher flowing intake manifold for increase performance. That can be an issue if you live in colder climates. The factory heater grid pre-heats the inlet air to aid in starting the engine. Re-install or replace a failed heater grid with this factory Cummins Replacement Heater Grid to start your engine with ease on those colder days. This is a factory direct replacement part and is thoroughly tested to ensure proper operation. Installs using factory hardware and factory style wiring connections. Bolts, wiring, and gaskets are not included.