I donno, just by the math the lightweight front rotors (-10 lbs per front corner, rotating and unsprung) should be a pretty decent little acceleration boost. Even by a reasonable estimate of calling that worth 5x regular sprung weight, that's like taking 100 lbs out of the car acceleration-wise. So ballpark equivalent to ~10hp in engine gains on a Z? Very fuzzy conversions there, and still not nearly as important as anything else mentioned above, but still I'd say it does make a difference.
The main problem with the lightweight 2-piece rotor setups is they cost too much for what they give you.
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