Parts such as the Muffler: Body,muffler 1st, Body,muffler 2nd, Nut, Body,muffler 1st are included in the Tr50s 1998 (w) (e02 E04 E22 E26 E34 E53) Muffler parts fiche.
The Muffler assembly is constructed from several parts from which the Body, Muffler 1st is the most expensive.