IWG75 TP BW B1 Single Scroll 14 PSIIt is all about control The Twin Port IWG 75 uses the air pressure differential between two sealed chambers to create a dynamic force which overcomes the mechanical spring force in the actuator. Creating a boost curve that is much more precise, and allows for a much wider boost range between minimum boost and maximum boost, than the single tier control offered by conventional actuators. This makes the Twin Port IWG 75 ideal for traction limited