SHROUDED EXHAUST GAS PIPE IN AN EXHAUST GAS SYSTEM OF AN INTERNAL COMBUSTION ENGINE WITH AN AIR COOLING SYSTEM AND RADIATION HEAT EXCHANGE

The invention relates to a shrouded exhaust pipe (3, 4, 5, 6) in an exhaust system of an internal combustion engine (1) especially an internal combustion engine of a motor vehicle -, wherein an air guiding channel (8) is formed between the sheath (11) and the exhaust pipe in order to cool said exhaust gas pipe. The outer side (14) thereof inwardly defining the air guiding channel (8) and the inner side of the sheath (15) outwardly defining the air guiding channel (8) in a radial direction are respectively provided with a surface having a radiation correction value for the radiation between the two surfaces of >0. 8 in at least one partial area in the longitudinal direction of the exhaust pipe.