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Motor vehicles emissions regulations become more and more stringent, concerning the air quality improvement. In that way, EGR technology ( like Exhaust Gas Recirculation ), with increasing recirculation flowrates, is more and more frequently applied [3]. If the manifold is made in polymer composites, problems appear at the EGR interface, because of material T° limits ( between 150° and 180 °C stabilized ). The study presents different goals: 1. To identify the major parameters leading to high manifold heat constraints; 2. To model the phenomena, to be able to extrapolate experimental results; 3. To get a practical tool, under abacus and model, helping designers to know the limits of the design, for one application, and so that, to be sure that the manifolds will not be overstressed in service. To get this, both experimental and numerical ways are taking into account. Let us remind that EGR is applied to limit NOx levels, and also fuel consumption by pumping losses limitation [3].