Boosted Engine Systems components are those that supply and control the combustion air to the engine. The Boosted Engine Systems strategy is to optimize the air supply system to provide best efficiency for the actual intended duty cycle. This process involves measuring and analyzing the engine/vehicle duty cycle, and then optimizing the design of the system for best efficiency during that mode of operation. This approach can improve fuel efficiency, reduce emissions, reduce system weight and cost, and reduce the number of components in the system. Suggestions are made for optimum component design to meet system needs.