muffler

thumb|right|Silencer (silver) and exhaust pipe on a [[Ducati motorcycle]] thumb|right|A silencer cut open to show the insulation, chambers and piping inside the shell

A muffler (North American and Australian English) or silencer (British English) is a device for reducing the noise emitted by the exhaust of an internal combustion engine—especially a noise-deadening device forming part of the exhaust system of an automobile.