Don't know much about the innovative boost control, but there is a big diff between "manifold" and turbo casing. In one case you are controlling boost to the engine, and in the other you are controlling turbo discharge pressure. Pressure drop through the IC makes a difference. Also, the manifold will under vacuum when the throttle blade closes, but the turbo casing is never under vacuum. Don't know which way Innovative wants it, but it may make a difference.