Abstract: A muffler for the exhaust gas system of an automobile has a housing provided with two end walls and a circumferential wall and at least one exhaust gas channel passing therethrough. The muffler assembly also has at least two pipes, which mostly define the exhaust gas channel, which are arranged successively in the flow direction, and whose ends project into the interior of the housing. A transverse wall is provided in the housing, this wall being connected to the circumferential wall on the inside, running transverse to the exhaust gas channel and having an opening passing therethrough, said wall comprising at least two flexible wall sections in the axial direction, each having one edge adjacent to the opening, the ends of the pipes each being held at their outer side by the edge of at least one wall section.

Abstract: An exhaust system for a motor vehicle includes a heat exchanger that protects a NOx storage device against exposure to extraneous temperatures. The heat exchanger is formed from an outer and an inner pipe. A radial gap is formed between the two pipes which, at its front end facing in the opposite direction to the direction of flow, has a seal that prevents exhaust gas from entering. The region of the inner pipe which adjoins the seal is interrupted by bypass openings. At a rear end, which faces in the direction of flow, the inner pipe is formed with an outlet opening and the inner pipe is narrowed in the manner of a nozzle. The outlet opening is connected to the radial gap.