Return fuel more smoothly from idle to improve fuel economy.Cleaner oil helps to extend engine life.Reduce smoke and dust output. EGR Cooler Valve Kit For 2011 2012 2013 2014 2015 2016 For Duramax EGR Upgrade Kit. Reduced exhaust pollutants: Introducing some exhaust gas into the intake manifold and back into the cylinder lowers combustion temperature, reducing nitrogen oxide emissions. Protecting the EGR valve body extends its service life. Optimizing air-fuel mixture improves engine performance. It maintains reliable operation even in extreme engine environments and protects the engine from damage caused by abnormal pressure., Manufacturer: zengyanyan