Of all the components used in this assembly the Set,air/c Case is the most expensive.
Parts such as the Air Cleaner: Bolt Wash,5x28, Element Comp,air/, Seal Rubber B,air/c, Grommet,t/b Cover are included in the Civic 2005 (5) 3dr Si (ka) Air Cleaner parts fiche.
The lowest price component in this Air Cleaner parts-list fiche is the Nut,flange,6mm.