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The development of the S-designed metallic catalytic converter and the flexibility of its production paved the way for the first conical converter with continuous cell enlargement. This type of conical converter, installed upstream from a standard catalytic conversion system exerts a positive influence on flow distribution and converter efficiency, both during the cold start and under operating conditions. The study results outlined in the following text demonstrate the potential for increased catalytic effectiveness, taking the example of the close-coupled application.