The idea is that you put the rotors in a freezer and slowly drop the temperature to around -250 degrees F. This "aligns the molecules" and supposedly makes for harder wearing metal.
I have read that you can also apply the cryogenic treatment to the crankshafts and gear sets, and there are many applications of cryogenic treatments on the aerospace industry as well.
PS: I am Not an engineer, but I slept at the Holiday Inn last night ...LOL
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Rgds, Fred
#317 550 Spyder Anniversary Edition 2004 Boxster S, 3.8L Flat Six Innovations engine, PSS9s, etc, etc . . . The contents of my posts are for entertainment only. As confirmed by my many motor sports fails, I am not qualified to give product endorsements or mechanical advice