The Washer, Plate(3mb) is the lowest priced item on this Exhaust schematic.
A sample from the products for the Exhaust include: Bolt, Hexagon Socket Head(38v), Clamp, Hose (5x8), Washer, Plate (3l5), Screw, Binding (8g6).
The Exhaust assembly is constructed from several parts from which the Silencer Assy is the most expensive.