The component with the lowest price in the EXPANSION CHAMBER (EXCEPT CR125R-CM) schematic is the Bolt,recessed,5x1.
The Expansion Chamber (except Cr125r-cm) assembly is constructed from several parts from which the Chamber Comp,exp is the most expensive.
With a quantity of three pieces, the Rubber,silencer is the most used part in the EXPANSION CHAMBER (EXCEPT CR125R-CM) diagram.