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Two stage turbo charging provides a suitable method to achieve a significant increase of the boost level, as well as a wider operating range for a diesel engine. This paper describes detailed and easily applicable method for two stage turbocharger matching for constant speed engine, in view of finding an optimal combination of turbochargers - low and high pressure ones. It also describes technique that can be used for optimizing solution with better fuel consumption and boosting together with satisfying of all given constraints such as maximum before turbine and compressor out temperatures, maximum turbocharger speed, peak cylinder pressures and smoke limit. This paper presents evaluation of potential for two stage turbocharger for power generation application by simulation and then experimental results.