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Again, its not the number of pistons, it's the total piston area and rotor size. 6 pistons doesn't neccessarily mean more brake torque or fade resistance. More pistons usually means better feel and more even pad wear. Might be heavier and generally more money.
Honestly I see the fact that they went with 355 mm rotors as more concerning. That's a BIG ass heavy rotor and a 330 or so would be a much better lighter choice and that's still huge for this car. As in even if I was building a competition car I probably wouldn't go with 355s because it'll be slower.
You won't fade a 328 mm rotor with good pads and fluid even with Hoosiers (unless you really can't drive).
- drew
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