The component with the lowest price in the MUFFLER(S) schematic is the Nut,flanged,10mm.
Parts such as the Muffler(s): Bolt, Muffler, Gasket,exhaust Pipe H (nas), Damper are included in the Er500b4 Er5 2000 Europe Fr Fg Muffler(s) parts fiche.
Of all the components used in this assembly the Muffler is the most expensive.