The most reasonably priced component used on the Gsx600f 1999 (x) Muffler is the Nut.
The most expensive part in this assembly is the Body Comp,muffler.
Some items from this specific schematic: Gasket,exhaust (nas), Spacer(8.6x12x24.2), Spacer(8.6x12x27.1), Exhaust Comp.