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Mitsubishi Heavy Industries, Ltd. (MHI) continued research to improve turbocharger compressor and turbine wheel aerodynamics has resulted in a new “G”-Series compressor wheel and “L”-Series turbine wheel. These new generation wheels offer lower inertia and improved performance in a smaller package size when compared to previous designs of similar flow capabilities. This paper discusses the design features of these state-of-the-art turbocharger wheel designs and presents performance improvements as demonstrated on the gas stand and engine dynamometer.