My inquiries to the engineers say that yes we are running the C50. Whats crazy is that the C50 code is shared amongst not only our xD, but also the corolla (AE92), MR2 Turbo, Celica MR2 Spyder, and toyota/lexus E350. So what we learned was that the "c50" code was clearly not enough info to find out compatibility. The Quaife unit we used and is compatible is the celica mr2 spyder unit.
i'll email quaife and let you know if it works on the A/T.
ACT is still getting back to me on specs on the clutch units.
---------- Post added at 09:50 AM ---------- Previous post was at 09:48 AM ----------
One of our more recent video's from our race at Washington if you haven't seen it yet.
http://www.youtube.com/rallyxd/#p/a/u/0/V1o92Cgtkyo