A silencer for an exhaust gas system of an internal combustion engine, comprising a silencer housing which surrounds a silencer interior with at least two housing portions (16, 18) which are adjacent to each other in an abutment region and which are connected to each other and at least one outlet pipe which extends through the silencer housing in the region of a housing opening which is formed in the silencer housing, wherein at least one housing opening through which an outlet pipe extends is completely formed in one of the housing portions (16, 18), wherein the silencer housing comprises two housing shells (20, 22) which each provide a housing portion (16, 18) and which are each connected to each other in the abutment region by means of material engagement and/or positive-locking engagement, wherein at least one housing opening which is completely formed in one of the housing portions (20, 22) is formed in one of the housing shells (20, 22), wherein the silencer housing presents a circumferential wall which is elongate in the direction of a longitudinal housing axis and comprises at both axial end regions of the circumferential wall an end wall (32, 34) and in that at least one housing opening which is completely formed in one of the housing portions (16, 18) is formed in the circumferential wall, characterized in that - at least one housing opening which is completely formed in one of the housing shells (20, 22) is formed in a substantially non-curved region of the circumferential wall, laying in a plane, - in at least one outlet pipe passing through the silencer housing in the region of a housing opening formed completely in one of the housing shells (20, 22), a longitudinal centre axis of this outlet pipe is angled in the region of its longitudinal region passing through the housing opening with respect to an opening centre axis which is essentially orthogonal to the plane, - in the region of at least one housing opening formed completely in one of the housing shells (20, 22), the housing shell (20, 22) is deformed in the direction away from the silencer interior to provide an edge region surrounding this housing opening, - an outlet pipe passing through at least one housing opening formed completely in one of the housing shells (20, 22) is connected to the silencer housing in the region of the edge region surrounding this housing opening by welding. - at least one housing opening which is completely formed in one of the housing shells (20, 22) is formed in a substantially non-curved region of the circumferential wall, laying in a plane, - in at least one outlet pipe passing through the silencer housing in the region of a housing opening formed completely in one of the housing shells (20, 22), a longitudinal centre axis of this outlet pipe is angled in the region of its longitudinal region passing through the housing opening with respect to an opening centre axis which is essentially orthogonal to the plane, - in the region of at least one housing opening formed completely in one of the housing shells (20, 22), the housing shell (20, 22) is deformed in the direction away from the silencer interior to provide an edge region surrounding this housing opening, - an outlet pipe passing through at least one housing opening formed completely in one of the housing shells (20, 22) is connected to the silencer housing in the region of the edge region surrounding this housing opening by welding.