The Air Cleaner assembly is constructed from several parts from which the Case,air/c is the most expensive.
The component with the lowest price in the AIR CLEANER schematic is the Screw,tap 5x12mm.
Some items from this specific schematic: Screw,tap 5x12mm, Duct,air/c, Tube L,air/c Conn, Screw Tapping5x25.