July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Description And Operation: Operation

Engine condition	VIS valve	Operation
Medium speed	OFF	Increasing engine performance in low engine speed by reducing intake interference among cylinders
Low/High speed	ON	Minimizing intake resistance by shortening intake manifold length and increasing area of air entrance

Fig 1: Variable Intake Manifold Solenoid Valve Air Entrance Increasing Area

Courtesy of HYUNDAI MOTOR AMERICA