A steady gas flow in automotive catalyst converter with fore- end shaped honeycomb carrier was simulated based on ANSYS- CFD code and tested as well as the influence of the carrier fore- end types matching of diffusion header on flow diametral uniformity. The effects showed that coneheaded and sphereheaded honeycomb carrier improved the flow diametral distribution especially in coneheaded honeycomb carrier matching of EDH. The cone apex angle should be controlled between 60°and 90°so as to get comprehensive...