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One look at a GiroDisc 2-piece slotted rotor will give you a very clear idea of why they perform so much better then the factory one-piece cast iron parts. It’s a classic case of form following function. They’re simply beautiful. Starting with the hard anodized 6061-T6 aluminum hats all the way out the proprietary 32-vane design of the rotors themselves, every part was designed to simply work better. The hats help reduce heat transfer to bearings and wheel hub carriers. The drive pins have a stress relieving back cut radius under the head to insure maximum strength as well as cadmium plating for the ultimate resistance to corrosion. Even the spring washers are made of a high temperature alloy in order to insure rattle free performance even during the most aggressive driving conditions. The GiroDisc rotors are slightly larger when compared to the factory parts, measuring 340mm in the front and 325mm in the rear, yet they are designed as directly factory replacement and work perfectly with the OEM Porsche calipers. Even the e-brake is left intact. The bottom line is that you won’t find a better built, better engineered, or better performing replacement rotor option on the market today
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