An exhaust system for internal combustion engines with an exhaust tract which has for an exhaust stream at least a first flow path designed as a first pipe and a second flow path designed as a second pipe, wherein the second pipe is formed as a pipe which is thinner than the first pipe, with a smaller flow area compared with the first pipe, the first and second flow path (3, 4) extend, fluidically separated from each other, from a front silencer to at least one rear silencer separated spatially from the front silencer, and the first flow path which is designed as the first pipe can be closed continuously dependent on engine speed by means of a controllable flap, wherein the exhaust stream when the flap is closed is conducted through the second flow path which is designed as the second pipe, wherein the first and second flow path (3, 4) extend into the rear silencer, the first flow path penetrates through the rear silencer in the direction of flow completely as far as an outlet, the second flow path in the rear silencer ends in a chamber which provides a flow cross-section area which is suddenly enlarged by at least double compared with the second flow path, the first flow path in the rear silencer is fluidically connected to the chamber and the first flow path within the rear silencer is designed with perforations, the rear silencer is subdivided in the direction of flow by a separating element, with in an upstream first portion the chamber and in a downstream second portion adjoining the outlet an insulating means being provided, wherein the insulating means surrounds the first flow path and the first portion determines two thirds and the second portion one third of the total length of the rear silencer, and the separating element seals off the chamber from the second portion. the second pipe is formed as a pipe which is thinner than the first pipe, with a smaller flow area compared with the first pipe, the first and second flow path (3, 4) extend, fluidically separated from each other, from a front silencer to at least one rear silencer separated spatially from the front silencer, and the first flow path which is designed as the first pipe can be closed continuously dependent on engine speed by means of a controllable flap, wherein the exhaust stream when the flap is closed is conducted through the second flow path which is designed as the second pipe, wherein the first and second flow path (3, 4) extend into the rear silencer, the first flow path penetrates through the rear silencer in the direction of flow completely as far as an outlet, the second flow path in the rear silencer ends in a chamber which provides a flow cross-section area which is suddenly enlarged by at least double compared with the second flow path, the first flow path in the rear silencer is fluidically connected to the chamber and the first flow path within the rear silencer is designed with perforations, the rear silencer is subdivided in the direction of flow by a separating element, with in an upstream first portion the chamber and in a downstream second portion adjoining the outlet an insulating means being provided, wherein the insulating means surrounds the first flow path and the first portion determines two thirds and the second portion one third of the total length of the rear silencer, and the separating element seals off the chamber from the second portion.