On this parts fiche the Spring is the most specified component.
Parts such as the Muffler: Gasket,exhaust Pipe (nas), Silencer,muffler, Silencer,muffler, Bolt,6x20 are included in the Rm85l 2003 (k3) Usa (e03) Muffler parts fiche.
The most expensive part in this assembly is the Body,muffler,1.