With a quantity of four pieces, the Bolt(6x16) is the most used part in the 2ND AIR diagram.
The 2nd Air is made up of components including this Valve Assy,air Cut which is the most expensive.
This schematic depicts all components used in the Gsx1300r Hayabusa 2008 (k8) Usa (e03) 2nd Air partslist.