Originally Posted by projekteg

are you being serious? it's the thing that opens up and let's the pressure out of the turbo one it reaches a certain boost level. an external wastegate can be adjusted with a boost controller, an internal has to be adjusted by shortening or lenthening the actuator rod. all turbos come with an internal wastegate (i think), to use an external, you block off the internal wastegate flapper via your downpipe and disconnect your actuator