How tuned are you?
I think a good quality 10/50 is a great balance. I run Miller's CFS 10/50 in my bug and the nanodrive in my type r.
10/40 if standard , 10/50 if tuned and fast road/track, 10/60 if dedicated track only and if your temps are getting up there often. I think the main idea with a 10/50 or 60 is just better bearing protection etc. Just be sure you let it warm up properly etc.
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