:Due to the more stringent emissions regulations the catalytic converter has to move closer to the engine. In this hostile environment it is important to have a mechanically durable system, which survives under these severe conditions. This paper shows the evaluation and system design for a close coupled converter. The mechanical durability of this system was proven during an on-road-durability test. During the entire test temperatures were measured inside the converter, at the shell and in the engine compartment to show the thermal management of this system.