The Collar,ex.pipe is the most widely applied product in the XR250R 1983 (D) F-16 EXHAUST MUFFLER ( four times ).
Some items from this specific schematic: Screw-washer 6x12, Rubber,protr.pkg. (nas), Lid,muffler, Pipe Comp.,tail.
The F-16 Exhaust Muffler is made up of components including this Muffler Comp. which is the most expensive.