The exhaust gas recirculation valve – EGR valve for short – recirculates finely metered quantities of exhaust gas to the engine intake system. The benefits of mixing exhaust gases with air entering the engine are two-fold; Combustion temperatures in the combustion chamber decrease and production of nitrogen oxide (NOx) emissions is reduced. With less chance of rough idle, engine performance is improved and exhaust becomes much cleaner. With so much at stake, you’ll want your EGR valve replacement to be a quality brand with proven OE technology, just like ours.