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Porterfield R4 are what I use, the sweet spot is 450-800F. These are great for open lapping, but would not be suited to most de sessions, you won't have enough time to warm up.
You would be better suited to the r4s, temps for those are about 250-600F. Less friction coefficient, but should not matter because you may never heat the r4 up enough to hit their higher number in 25-30 min sessions.
I get them from best brakes, takes a week or so to ship sometimes more, I think they make them to order.
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