Parts such as the Muffler(s): Pipe-exhaust, Bolt,flanged,8x18, Gasket,38.9x46.4x3.0 (nas), Cover-exhaust Pipe are included in the Kx450-fcf Kx450f 2012 Usa Muffler(s) parts fiche.
The Muffler(s) assembly is constructed from several parts from which the Body-assy-muffler is the most expensive.
In this schematic the "Bolt,flanged,6x10" is used most often.