An exhaust muffler for use with an internal combustion engine has at least one internal suppression chamber, at least one inlet pipe for receiving exhaust gases from the internal combustion engine, and at least one outlet pipe vented to atmosphere. The exhaust muffler comprises a plurailty of component...http://www.google.com.au/patents/US4880078?utm_source=gb-gplus-sharePatent US4880078 - Exhaust muffler
