I've got the stage 2 RR kit (Wilwood 6r superlite caliper). I've tried two pads on them. BP20 pads only squeal when cold, which is great for track use since brakes are never cold on track. Polymatrix Q pads (with shims and grease) only squeal when hot, which is fine for non-aggressive street use.
It's not a perfect solution, but good enough for me.
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