BulletProof Engine Oil System Upgrade 2003 2004 Upgraded Oil Filtration Heavy Duty Air Oil Cooling; Designed for All Climates manual tips 3 uses a patented H Core technology OEM= 2884831 uses a patented H Core technology (helically wound internal stainless steel tubing) to add a level of durability meant to last the lifetime of your vehicle The patented helical core technology features a strong core of helically wound stainless steel tubes capable of bending and yielding where the traditional OEM EGR cooler fitted during manufacture is likely destined to eventually rupture and fail Keep in mind Upgrading your engine oil cooler is one of the MOST IMPORTANT upgrades you can do if reliability and longevity is your goal