The manifold for this system would use a separate throttle plate assembly for each cylinder, with the injector ports on the manifold.
Multiple vacuum ports on the manifold would be plumbed to provide vacuum measurements in addition to IAC Valve use.
Designing a whole system instead of just a manifold would reduce the cost of the system overall. The cost of the manifold itself would not change, as adding ports does not add much in terms of manufacturing. Instead, the savings would come from the throttle plates. They are simpler to manufacture and are cheaper than purchased ITBs. The challenge with this, however, is my lack of knowledge in ITB systems.
