These pads are for my 2003 Silverado Extended Cab 4X4. At first they were so loud it felt like I was trying to stop with gravel instead of regular pads. It was a resistor in the coating that did its job of removing the glaze from the existing rotors. I bought new EBC USR series sport rotors to work with these pads. The noise lasted about the first 20 miles, and each mile is quieter than the last. I did the EBC break-in procedure to brake with pads for 400 miles. At over 3,000 miles with EBC brake pads and rotors, the truck stops better, smoother, quieter and shorter than any combination I've used up to that point. I've worked with cars and trucks for 45 years and although I now live in Kentucky I've lived most of my life in western Pennsylvania where brakes are taken seriously!