GFB 7301 Wastegate Actuator fits MITSUBISHI Lancer EVO 6 to 8Specific Product Information The WGA, Wastegate Actuator is a high performance internal wastegate actuator designed to improve boost control on internally wastegated turbos. By using a significantly larger diaphragm area than the OEM actuator, the WGA has more control authority over the wastegate flap, meaning exhaust backpressure cannot override the flap position as easily, resulting in more stable and reliable boost control. Supplied with 3 springs