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 Operation Diagram

Courtesy of KIA MOTORS AMERICA, INC.