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The powertrain air intake system in internal combustion engines have great effect over power and torque, generally it is designed for high volumetric efficiency, however it is as well an important source of noise with effects over the internal comfort of the occupiers of the vehicle and the pass-by noise. It is known that increasing the transversal sections of the ducts of passage is one of the usual ways to increase the volumetric efficiency of the intake process, but on the other hand, this procedure decreases the capacity of acoustical attenuation generating an increase in the radiated noise. We have here a very conflicting situation, which requires a balance or adjustment of these parameters of project. In these situations the utilization of numerical tools are of great value, for they allow to evaluate and optimize the variables with conflicting effects, especially here the acoustical and fluid dynamical performances. Theses simulations can use 0D/1D and/or 3D numerical tools.