The Gsxr600 2004 (k4) Usa (e03) 2nd Air consists of nine pieces with the Valve Assy,air Cut being the most expensive.
Some items from this specific schematic: Bolt, Bracket,2nd Air Valve, Clip, Hose,2nd Air Cleaner.
Of all the components that make up this 2nd Air the Clip has the lowest price.