Patent ID: 7810609

Claim:
A muffler comprising: an exhaust pipe having a plurality of perforations and at least one pipe sealing flange extending generally radially outwardly; a polymeric housing carried by the exhaust pipe and enclosing the plurality of perforations, the polymeric housing including (a) at least one polymeric housing sealing flange integrally formed of the polymeric housing extending generally radially inwardly toward the exhaust pipe and spaced radially from the exhaust pipe and spaced axially from the at least one pipe sealing flange and (b) at least one polymeric divider wall integrally formed of the polymeric housing disposed within the polymeric housing that at least partially defines a plurality of acoustic chambers within the polymeric housing that each is disposed in fluid flow communication with a corresponding plurality of exhaust pipe perforations; and thermal insulation disposed axially between the at least one pipe sealing flange and the at least one housing sealing flange, radially between the at least one housing sealing flange and the exhaust pipe, and radially between the at least one pipe sealing flange and the housing.