Mixing and/or evaporating device

A motor vehicle combustion engine exhaust system comprising:

• a flow structure defining a flow path for an exhaust gas flow;
• an SCR catalytic converter operatively connected to said flow structure for flow through by at least a portion of the exhaust gas flow;
• a reduction agent feeding device comprising at least one injector for feeding a reduction agent to the exhaust gas flow, the injector being disposed upstream of said SCR catalytic converter;
• and
• a mixing and/or evaporating device for an exhaust system of a combustion engine, the device comprising a support body which encloses a cross section of the device through which a flow can flow and which runs transversely to an axial direction of the device and a guide blade arranged on the support body, the guide blade extends transversely to the axial direction, the guide blade having a roof-shaped profile comprising two guide surfaces which are interconnected via a ridge or apex.