Turbosmart IWG75 Subaru WRX MY15 07 PSI (TS-0605-3072)Turbosmart's IWG 75 Internal Wastegate Actuator allows more precise control over the flow of exhaust gas to the turbocharger compared to the stock actuator, creating a flatter, more stable boost curve with less drop off at the end of the rev range. The result is a more drivable car with better turbo response, smoother power delivery and less lag.