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This work brings and proposes a simulation methodology to virtually investigate a 2-stage Turbocharger application for a heavy duty diesel engine. The motivation of the work is the research and development of an engine which is supposed to comply with very restrictive emission regulation policies, namely Euro V, VI and EPA 10, besides Tier 4 Final. Although emission level is, itself, a main concern (mainly NOx and engine-out PM), the present work present a methodology which covers air flow and boost ability of the entire engine and it is designed to be able to properly evaluate turbocharger designs possibilities (TC matching). In order to find the unknowns of the physical problem and, then, to verify the methodology success, some not usual measurements were done, such as of TC shaft speed using NVH techniques.