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The process and the tools that are used for engineering an optimum engine air-flow subsystem are critical for the successful execution of an engine program. From the perspective of the Air-Flow Subsystem Engineer, the requirements and concept subsystem of components, component subsystem, engine subsystem, and vehicle system engineering processes are described. Additionally, applicable tools such as benchmarking, engine cycle simulation, vehicle simulation, computational fluid dynamics, steady air-flow bench, engine dynamometer, and vehicle testing are explained. As an example, this paper illustrates the process by which a modern, high-performance, high-volume production-intent engine air-flow subsystem, in particular, the intake manifold component, is engineered and how these tools are applied.