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Your post has had 50 views so far and no one has replied, so I'll give it a shot.
There isn't a good option for engine tuning for the S2 RX8. The S1 has had multiple piggyback solutions and they were all found to be lacking in one way or another. It wasn't until the AccessPort became available that there was a good way to tune the engine using the cars ECM. These same piggyback modules may be able to be adapted to the S2, however the same problems would exist as there was on the S1. Of course the AccessPort isn't available for the S2.
Until a acceptable tuning solution is available for the S2, there won't be a working turbo kit for the car. The S2 wasn't produced in large enough numbers that it would be profitable for one to produce a solution.
I am not an expert on these things, I only know what I have read on this site over the past 6 yrs. There may be some fine points that I got wrong, but in general, I believe this is the state of things. At least, it will be a starting point for the discussion.
__________________ Don't try this at home. It could be dangerous. I have years of experience.
Emissions and fuel economy haven't exactly been areas of strength for past rotary power plants, but absolutely no one with a soul has ever cared. - Autoweek
Rotary History:1982 RX7 GS, 1985 RX7 GSL-SE, 2004 RX8 Sport-Continuous Rotary Owner since 1985
Racing History:SCCA Solo II 1979-1986, Skip Barber Comp School 1983, SCCA Club Racing 1987-1993, 2004-2011 Track Days