Exhaust device and method of manufacturing thereof

An exhaust device comprising:

• a casing comprising an inlet configured to receive an exhaust gas, an outlet configured to discharge the exhaust gas, and a chamber disposed therein between the inlet and the outlet, the casing defining a longitudinal axis along its length;
• an exhaust conduit at least partially received within the chamber of the casing along the longitudinal axis, the exhaust conduit comprising an inner surface, an opposing outer surface, a plurality of perforations extending through the exhaust conduit from the inner surface to the outer surface, and at least one protrusion extending outwardly from the outer surface and spaced from the plurality of perforations;
• an absorptive material disposed on the outer surface of the exhaust conduit, the absorptive material comprising a first end facing the inlet of the casing and an opposing second end facing the outlet of the casing;
• and
• a plate fixedly attached to the outer surface of the exhaust conduit and spaced apart from the absorptive material relative to the longitudinal axis, wherein the plate and the outer surface of the exhaust conduit defines a slot therebetween, such that the slot comprises at least one open end disposed in fluid communication with the chamber, and wherein the exhaust conduit further comprises an opening extending from the inner surface to the outer surface and disposed in fluid communication with the slot;
• wherein the plurality of perforations of the exhaust conduit are disposed between the inlet of the casing and the second end of the absorptive material relative to the longitudinal axis;
• and
• wherein the at least one protrusion of the exhaust conduit engages with the absorptive material in order to form an interference fit between the absorptive material and the exhaust conduit, wherein the interference fit prevents a relative movement between the absorptive material and the exhaust conduit at least along the longitudinal axis.