The current trend of vehicle manufacturers is increasingly driven towards the use of downsizing technology, which coupled with turbocharging technique, allows obtaining engines with higher power densities and characteristics in terms of emissions, performance and fuel consumption much better than a conventional engine. The achievement of this target is clearly not any easy task for developers which have to perform a considerable amount of studies to optimize the system and find the compromise which best fits all requirements. Therefore, fluid dynamic analysis, using dedicated CFD software, in addition to experimental tests, are fundamental for the analysis and optimization of engine turbomatching: the former in particular becomes essential considering the lack of data often available and the huge amount of time required at the test bench.