:bs!:
XR6 turbos have been resticted, the original housings are too small (internally), therefor clamping their power to about 350hp. If you hi-flow (port the original housings; front and rear) then yes, an easy 700hp with external gate. A actuator has not yet been designed to reliably handle 700hp without boost spikes, etc. But if you want to say they have, well i wont stop you, but please state a known brand turbo that is internally gated and can reliably hold boost at 600+hp.