Having know RalliSpec from the beginning (my brother was their first customer...I was there the first day watching/helping the Minnam turbo install), and a turbo kit from them is not a new idea. They were talking about it over a year ago, and have been working on it since (along with all the other stuff they work on). I am glad that they are going to eventually come out with something, and I would not hesitate to buy it from them.
For the person that asked about the 99GT sedan, remember the DOHC engine setup is the same as the 98 2.5RS. My 99 2.5GT is almost identical to my brothers 98 2.5RS, and I can't see why the kit on his car (Minnam Stage 2) wouldn't work on the Legacy.
Check out all pics and info at www.lagging.com