The 1521 ended up being my DD pad on my Evo. They replaced StopTech branded Axxis Ultimates which replaced very dirty stock pads. I was very happy with them on the street. They were fine for autocross on street tires.
One weekend I was instructing at Chuckwalla and the weather was too miserable (wind storms causing the track to LITERALLY disappear) to bother changing wheels and brakes. So I ran some instructor laps on the street tires and 1521's. While they worked fine, the weather was so awful I really didn't get to run at speed so I can't say what would have happened otherwise.
By way of comparison I was able to fade Hawk HT-10's at SOW running CCW but the RP2 never faded. Frankly this pad may be enough for non-competition use with the stock system. We will see...
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