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In order to meet the customers comfort requirements, reduction of noise in the passenger compartment is one of the primary concerns in the automotive industry. Moreover, for a better reactivity to the market, vehicle development time tends to be shorter and shorter. Instead of constructing many prototypes and running a lot of tests, numerical simulation has to take a bigger part in the design of cars. This would be a cheaper and quicker way of testing many new solutions. We have developed for several years a numerical model, combining by Finite Element Method (FEM) and Boundary Element Method (BEM), for computing the vibro-acoustic behaviour of a fully trimmed car with engine and power train. This model allows prediction of the structure borne sound field due to the engine and wheels excitations at low frequencies (0-200 Hz).