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The use of Exhaust Gas Recirculation (EGR) system has become a popular way for reducing NOx levels in internal combustion engine. Reducing NOx and PM emissions from diesel engine, and improving fuel consumption simultaneously are important in meeting government regulations and society needs. Recently, an important goal in diesel engine research is the development of means to reduce the emissions of NOx and PM. Cooled EGR system is one of the most effective techniques currently available for reducing NOx and PM emission in internal combustion. In particular, EGR system has the trade-off relation between NOx and PM emission, especially at high loads. In the present study, engine dynamometer experiments have been carried on the characteristics which improve heat exchange effectiveness of EGR cooler with shell & tube-type and stack-type.