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For Model Year 2022-2024 GM introduced a Copper-Free brake pad/rotor option for SS & ZL1 models due to the restriction of copper infused OE pads. This featured a larger pad for the SS models, bringing up to the same size as the ZL1 models.  The factory rotor size on a SS 1LE for example is 370mm, but if you have the Copper-Free Version, that brings it up to a massive 398mm.  This also includes standard SS models with the 4-Piston calipers to now have 6-Piston Calipers in the front. …