Interested in doing this too. The petrol 4L Titanium is only available in RWD which I don't mind, less weight and they can fit a nice tall tyre on the back so traction will be in no way worse still.
I figure it's no harder than converting an FG N/A to turbo? Get turbo, exhaust and intake manifolds, set up a fuel reg and a 2 bar map sensor and off you go right? I'm probably a year away from going down this road but that's what I want to do. The Territory Titanium is like sitting in a FGX G6ET