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Get the definition of ultra-high-performance (UHP) with the Yokohama AVS S1, the Original Equipment tire on the Porsche Boxster. The AVS S1 features a super-sticky summer tread formulation, an aggressive asymmetric tread pattern and a W speed rating for high-speed performance and slot car-like handling and steering response. The summer tread formulation of the Yokohama AVS S1 tends to stiffen in colder weathe4, and like all summer UHP tires, this tire should be switched out when the thermometer is below about 40 degrees Fahrenheit.