For 2011-2016 For Duramax EGR Upgrade Kit. They are not running through EGR Cooler, thus the Coolant tempatures runs cooler. It completely replaces EGR Valve & EGR Cooler, No other parts required for installation. EGR Valve is a reliable and durable replacement part that ensures your engine runs smoothly and efficiently. When it comes to maintaining the performance and efficiency of your vehicle, one of the most critical components to keep in top condition is the Exhaust Gas Recirculation (EGR) Valve., Manufacturer: HUIXINQ