Abstract: A muffler for an exhaust gas system of an internal-combustion engine has an exhaust gas inlet and a first flow pipe arranged inside the muffler and completely penetrating the muffler. A shut-off device is arranged in the first flow pipe, for the shutting-off and opening-up an exhaust gas tail pipe which is situated downstream of the muffler and is connected with the first flow pipe. A second flow pipe partially penetrates the muffler, and has an overflow path between the first and second flow pipes situated inside the muffler. The first and the second flow pipes are connected with the exhaust gas inlet by way of a branching element and the shut-off device is arranged upstream of the muffler in the first flow pipe.

Abstract: A method is provided for operating a change-over element of a motor vehicle exhaust system. The change-over element is moved into a first position or a second position, whereby a first or second flow path is adjusted in the exhaust system. For an optimized actuation of the change-over element from the first position into the second position and/or vice-versa, an open position and/or a closing position of a vehicle part is taken into account which at least partially bounds the vehicle occupant compartment.

Abstract: A muffler for an exhaust gas system of an internal-combustion engine has an exhaust gas inlet and a first flow pipe arranged inside the muffler and completely penetrating the muffler. A shut-off device is arranged in the first flow pipe, for the shutting-off and opening-up an exhaust gas tail pipe which is situated downstream of the muffler and is connected with the first flow pipe. A second flow pipe partially penetrates the muffler, and has an overflow path between the first and second flow pipes situated inside the muffler. The first and the second flow pipes are connected with the exhaust gas inlet by way of a branching element and the shut-off device is arranged upstream of the muffler in the first flow pipe.

Abstract: An air filter housing for an internal combustion engine, which includes an unfiltered air capsule and a filtered air capsule, contains an orifice with perforations which are covered by air-permeable fabric or a sound element. Airborne sound emission occurs through these orifices and through the fabric or the sound element in such a way as to optimize the exterior and interior sounds of the vehicle.

Abstract: An air filter housing for an internal combustion engine, which includes an unfiltered air capsule and a filtered air capsule, contains an orifice with perforations which are covered by air-permeable fabric or a sound element. Airborne sound emission occurs through these orifices and through the fabric or the sound element in such a way as to optimize the exterior and interior sounds of the vehicle.