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I don’t think it’s just cosmetic; rear brake rotors have been getting bigger in part of accommodate brake-based traction control systems. And for those you need a fair amount of heat sink but clamping force is less important.
I noticed this when doing track days with ppl running 987.2s. Porsche went to a traction control system on that car but didn’t upsize the rotors, which were basically the same as the ones on my car. The rear rotors and calipers on the 987.2s got so hot the red paint turned brown.
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