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Real R compounds (Hoosier R6 or Kumho v710) are not gonna make it on the street for four reasons:
1) With only circumferential grooves thay look like slicks to most cops who will write you up regardless of the fact that they are DOT tires.
2) They tend to be poor at resisting sidewall damage. Just a stone thrown up can slice those suckers wide open
3) They will heat cycle top stones pretty quickly.
4) No resistance to standing water aquaplaning. Regardless of your beautiful SoCal weather, a little rain falls into every life.
A more practical R-like street tire is the Michelin Pilot Sport Cup or the Pirelli P-Zero Corsa. These tires sacrifice almost everything for pure grip (price, longevity, comfort and noise).
Another possibility is the Toyo RA1 - a great track tire with enough groove and heat
However, I would caution you against this quest for ultimate grip. You may think you want a race car with race tires but the sacrifices will quickly make the driving experience old.
Good luck,
Alan
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