Performance Tire for 15" Wheel?

Sumitomo HTR A/S P01, 215/60 meow...

Kumho Estca 225/50, yum.

You could always drop on the Toyo Proxies RA1's.

195 50/55 and 215-225/60 is about as big as they go for selection anymore for a tire that corners worth a crap. A lot of these suggestions are more oriented towards drag cars and not corners.

Check out onlinetires.com too.