Yesterday I was fortunate enought to visit the Rallispec garage. After some chatting with Andy about mods for my 2000 GT the subject matter touched on turbo topic.
The short of it is, they are planning 2 turbos. The first is a ~$5K or more kit that runs from intake to turbo to fuel management to exhaust with a range of 7-12lbs of boost. The second is more or less a custom (basically no holds barred) turbo that will utilize additional electronics intercooler placement and have boost in the 12-20lb range. I don't want to say too much because it is still in the works...
As a side note, Andy informed me that by looking at my 2000GT, there is a lot more room in the engine compartment than in the RSs, and room enought up front for a front mounted intercooler (esp. since I dont have the hood scoop.)
All in all, any kit purchased through them will definately have excellent workmanship, fit, and finish.