The different PCA Zones have different rule sets across the country, so chances are pretty decent that other areas will have different tire rules.
I suggest bopping over to
http://www.tirerack.com and looking at the treadwear ratings of their "Ultra High Performance", "Max Performance", and even "Competition" tires. The Yoko A032 just might have a 100 rating, but I think it's less. Kumho 712s are supposed to be very good for hard-compound street tires. Bridgestone S03's ditto. Those are supposedly available in the small sizes used by our 914s--many of the really aggressive tires start with 17" rims nowadays...
--DD