The component with the lowest price in the MUFFLER (STANDARD) schematic is the Screw,tapping,4x6.
A sample from the products for the Muffler (standard) include: Gasket,muffler, Screw,tapping,4x6, Protector,muffler, Bolt,flange,6x14.
In this schematic the "Screw,tapping,4x6" is used most often.