I agree with what the others have said. RA-1s, etc. will be better than normal street tires, but you will never get them warm enough to work right on an AutoX course. The only truely good choices for AutoX are A6s or V710s and you can tell a huge difference compared to other tires.
NT-01s and RA-1s are the exact same compound from what I've been told. NT-01s can be run without being shaved due to the tread pattern where RA-1s will chunk up some if they aren't shaved. I personally like the NT01s better from my experience, they seem to last longer.
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