Turbosmart Borg Warner EFR Twin Port B2 Single Twin Scroll 14PSITurbosmart's new Twin Port IWG 75 gives you an improved ability to control a wider range of boost from your internally wastegated turbocharger. Would Suit : Suits Borg Warner EFR B2 Single Twin Scroll series turbos. Other Information: It is all about controlThe 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