The lowest price component in this Muffler(s) parts-list fiche is the Screw-pan-ws-cros.
This MUFFLER(S) assembly utilises four Screw-pan-ws-cros(s) - the highest specified component.
Some items from this specific schematic: Cover-exhaust Pipe, Body-comp-muffler, Gasket,exhaust Pipe C (nas), Clamp,42mm.