2017-2019 L5P DURAMAX GDP EGR Cooler upgrade kit GDP421024.2017-CURRENT L5P DURAMAX GDP EGR DELETE GDP421024 Factory cooler setups recirculate soot and harmful gasses through your engine causing build-up and clogs, resulting in loss of performance and proven mechanical issues. GDP Cooler Upgrade Kits remove those concerns from the equation. GDP components install with an exact fit resulting in a longer lasting & better running truck, less turbo lag for better throttle response, cooler engine temps, less weight and a cleaner looking engine bay.Installation method:https://gdpproducts.com/wp-content/uploads/2020/07/GDP421024Manual.pdf