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Exhaust Gas Recirculation (EGR) is a consolidated in-cylinder technique in the automotive industry to decrease the Nitrogen Oxide (NOx) emissions of both diesel and gasoline engines. In order to comply with more stringent NOx limits the recirculating technology has evolved to enable higher EGR flow rates and accommodate more advanced control strategies. The increase in the cooling load demands the utilization of compact coolers with high thermal efficiency and the minimum pressure drop in both gas and coolant sides. In addition to the performance requirements, the design of the EGR cooler has a severe packaging constraint, is affected by the pulsating flow and fouling in the gas side and has to withstand high thermal stresses due to the large temperature gradients between the hot exhaust gases and the coolant.