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Nowadays, market shares for plastic intake manifolds are still increasing, although the competition with aluminum and magnesium is tough [1], [2]. It is becoming more and more apparent, that for a further spread one of the key issues is the managing of high temperatures generated by EGR inlets. Successful design of such devices will depend heavily on the correct prediction of the temperature loads. 3-D CFD calculations (e.g. with STAR CD or Fluent) turn out to be a valuable tool for this purpose. However, providing realistic boundary conditions remains difficult unless measured engine data for EGR mass flows and temperature is available. The alternative to experimental data is the calculation of boundary conditions with the help of a 1D charge cycle program, e.g. GT Power, which serve then as time dependent, tabulated input for the CFD codes.