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The Porterfield R4S is our favorite pad for performance street and autocross use. It does dust a little, but less than Hawk pads and its carbon kevlar construction is gentler on rotors.
Brian's Miata Application Notes: this is a great aggressive use street and autocross Miata brake setup...but look to our Miata big brake kit for hardcore track work!
Fits all 94 through 2000. Also fits 01-02 non-sport.