IWG-75 - Subaru WRX 1997-2007 TD04 - 7PSITurbosmart's high performance replacement Internal Wastegate Actuator for 1997 2007 WRX models fitted with the TD04 turbo is designed to get better boost response from the WRX's standard turbo, for those who wish to avoid the cost of an aftermarket turbocharger. The standard pressed steel actuator fitted to the Subaru's TD04 turbocharger is are easily forced open by exhaust gas, meaning it experiences slow boost build up and boost drop at high RPMs.