On this parts fiche the Collar,ex.pipe is the most specified component.
The sub assemblies and components that make up this Muffler Cb650c 80-81 include this Muffler Comp,r.ex, the most expensive part.
The most reasonably priced component used on the Cb650c 1981 (b) Usa Muffler Cb650c 80-81 is the Screw-washer,6x10.