A muffler has an integrated SCR catalytic converter for an exhaust line of an internal combustion engine, in particular in a motor vehicle The muffler includes a housing which has an intake trumpet on the intake end and an exhaust pipe on the output end. Catalytic converter elements are arranged in the housing with one inlet end in an inlet chamber and with an outlet end in an outlet chamber. An outlet end of the intake trumpet communicates with the inlet chamber. To improve the efficiency of the SCR catalytic converter the inlet chamber is sealed off from the outside and with respect to the intake trumpet and the catalytic converter elements to the extent that in operation of the internal combustion engine with exhaust gas loaded with urea, passing through the intake trumpet into the inlet chamber, the exhaust gas leaves the inlet chamber only through the catalytic converter elements.