CYPRESS, CA, November 13, 2017 - Toyo Tire U.S.A. Corp. (Toyo Tires®) and the National Auto Sport Association (NASA) are pleased to announce the creation of the Toyo Tires GT Challenge.  This new class features equally prepared Porsche® Cayman® GT4 Clubsport and GT4 Clubsport MR race cars competing on 18-inch Toyo® Proxes® RR DOT competition tires. The inaugural race will take place during the 2017 NASA 25 Hours of Thunderhill presented by Hawk Performance.The new GT Challenge class is the ...