The most expensive part in this assembly is the Chamber Comp,exh.. Parts such as the F-15 Exhaust Muffler: Mark, Harp, Bolt-washer,6x12, Packing,muffler (nas), Nut, Flange, 8mm are included in the Tlm50 1985 (f) F-15 Exhaust Muffler parts fiche.