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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.
DBA T2 Rotors utilize the proprietary Kangaroo Paw internal pillar design which provides superior cooling and more stable wear under high heat compared to conventional vane designs. All T2 rotors are slotted, not cross drilled! Why? Cross drilled rotors are notorious for cracking. We recommend slotted rotors, never cross drilled for ALL high performance uses and that is what we run ourselves.
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!