And by 3 port i mean it has three nipples and a bleed so maybe 4 port? Takes boost from the manifold and feeds it only to the side of the wastegate holding it shut until it switches open to bleed that side to air and feed boost to the open side of the actuator, it alows you to hold boost pressure+spring pressure of exjaust bqck pressure which on an internal gate garret is already at half the measured backpressure due to the size of the gate. The only reason to switch to external gates is if you are spiking where in the gate is physically too small to bypass enough gas to control the speed of the turbo.
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