The exhaust gas recirculation (EGR) system is used to reduce the emission of nitrogen oxide (NOx) in the exhaust gas. Nitrogen and oxygen react only under high temperature and pressure. The temperature and pressure in the engine combustion chamber meet the above conditions, especially during forced acceleration. When the engine is running under load, the EGR valve opens, allowing a small amount of exhaust gas to enter the intake manifold and enter the combustion chamber together with the combustible mixture. At idle speed, the EGR valve is closed and almost no exhaust gas is recirculated to the engine. Automobile exhaust gas is a kind of non combustible gas (excluding fuel and oxidant), which does not participate in combustion in the combustion chamber. It reduces the combustion temperature and pressure by absorbing part of the heat generated by combustion, so as to reduce the generation of nitrogen oxide. The amount of exhaust gas entering the combustion chamber increases with the increase of engine speed and load. Fitment: 11-15 Chevrolet 6.6L HD LML Duramax Diesel

Year	Make	Model	Engine
2011-2015	Chevrolet		6.6L HD LML Duramax Diesel
2011-2015	Chevrolet		6.6L HD LML Duramax Diesel
2011-2015	Chevrolet	SILVERADO 2500HD	6.6L 6599CC 403Cu.in. V8 OHV diesel turbine engine LML
2011-2015	Chevrolet	SILVERADO 3500HD	6.6L 6599CC 403Cu.in. V8 OHV diesel turbine engine LML
2011-2015	GMC	SIERRA 2500HD	6.6L 6599CC 403Cu.in. V8 OHV diesel turbine engine LML
2011-2015	GMC	SIERRA 3500HD	6.6L 6599CC 403Cu.in. V8 OHV diesel turbine engine LML

1* Inlet sealing plate 1* close exhaust plate 1* three-end cooling hose 4* clamp 8* screws