Fitted inside the airbox, the VAI system uses a set of movable intake funnels to alter the intake funnel height. When the VAI funnels are raised, intake air bypasses the system for optimal highrpm performance; when lowered, intake air passes through the taller intake funnels, for increased low-mid range performance. Movement of the funnels is regulated to maximise output at all rpm.
The use of the VAI system is limited to racing applications. To activate the system, the bike must be fitted with the race-kit ECU and sub-controller. In street-legal configuration, the system is inactive: the funnels are fixed in the raised position.