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The "S" is for street. They work great for street/autocross and light track duty. They dust a bit but are easy on rotors. Much better than factory pads for high performance use. For more serious race duty try the Porterfield R4-1 and R4.
Carbon Kevlar construction. One set needed for front. Does not include replacement springs, clips, etc.
This pad is made to order, please allow on week.