The Dorman Products Heavy Duty EGR Cooler, No. 904 5027, is engineered to match the fit and performance of the original EGR cooler on specific vehicle years, makes, and models. It has undergone rigorous testing such as heat transfer testing, burst testing, and vehicle try-on testing, as well as OEM benchmarking to ensure reliability, the company says. All necessary O-rings, gaskets, and application-specific hardware are included.