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Why Drilled and Slotted Rotors Fail on Technical Off-Road Trails Drilled and slotted rotors are everywhere in modern performance marketing, but they are deliberately excluded from this Willys Rubicon Killer build. On technical off-road trails, loose sand, silt, mud, and trail grit pack directly into rotor holes and slots.

KIA wasn't on my radar but I was determined not to pay for "Dealer Add Ons. Other dealers claimed the add ons were installed on the cars as soon as they roll off the car carrier and non-negotiable. Pitre KIA my local KIA dealer dropped them without hassling me.