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carbotech p+ sound a lot like the porterfield r4s. But the p+ look like they may be more for competetion and the r4s more for street. I think the r4s operating temps are rated 0-9xx opposed to the p+ which are closer to 1xx-11xx but work up to higher temps than the r4s. But just throwing another option out there. I use, and have had no problems with the r4s pads, but they only have 1 track weekend and about 7,000 street miles on them.
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