As an automotive enthusiast, I wasn't entirely convinced about the K4479 brake upgrade, but boy, was I pleasantly surprised! Based on my observations, these drilled and slotted ceramic pads improve the overall stopping power of my performance car significantly... They also seem to reduce brake fade and they have a more progressive feel to them. The only downer is that they can be noisy sometimes, but it`s a small trade-off for better braking performance..See full review