As most track folks know slotted brake rotors are superior to crossed drilled. After 13 track days my factory stock rotors started to exhibit stress cracks emanating from the cross drilled holes. After quite a bit of searching I found a source for slotted rotors for the 718 S. The front rotors on the S model are 330 mm dia. x 34 mm thick, rears are 299 mm x 20 mm thick. The source is: R1 Concepts, Inc. https://www.r1concepts.com/. You may want to call first to make sure they get the right config. for you. The cost is quite a bit less than factory, $307 for a front pair and $132 for the rears with free shipping. I just ordered a full set and plan to install and run starting April 2018. It will be a bit before I'll know if these parts are acceptable for tracking, but I'll post my results during their use.