No, you see at the end of the runner control lever at the back of the intake manifold on each side it has a vacuum opperated peice that bolts on the backof the intake and it has a vacuum line to it and the the intake runner control lever hooks to that and it moves the runner control inside the intake manifold that move these levers that open and close like a4bank carb would on my car there are two large openings on the throtle body so these runners on each side work on like that!