Externals tend to flow more. There is a limit to the size of a wastegate you can have internally. Also, internals tend to disrupt the exhaust flow out of the turbo, creating turbulence that theoretically affects performance.
In the words of Corky Bell: "You won't find an internal wastegate on a race car."
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'95 Eclipse TurboGS (garage deco) '95 TSi AWD (restoring a survivor) '97 Talon ESi-T (poor impulse control) '99 Eclipse RS-T (daily beater) '13 Evo X (mostly stock) '17 Sienna (Middle Aged Dad Mobile)
