Turbosmart Upgraded Wastegate Actuators have been developed to provide the maximum possible boost response for your factory frame turbocharger. The Turbosmart IWG75 Series of upgraded Actuators benefit from an increased Working Ratio over the factory equipment resulting in improved boost response throughout the RPM range.Mitsubishi Evo Internal Wastegate Actuator (IWG) provides better turbo response and greater sensitivity when managing boost pressures.14 psi Version is a direct replacement for the factory item. All other versions will require tuning/calibration of your engines ECU.Choice of Springs from 3psi to 26psi (Optional)High-Grade Billet Aluminum ConstructionTurbosmart Unique Locking Collar SystemProprietary Silicon Nomex DiaphragmStainless Steel Rods and Clevis