My Grand prix used to be my brothers and when he owned it he bought some drilled and slotted rotors from Napa, he spent $1000 on all four(I thought was way to much), and then about two months later he gave me the car. After I drove it for about 6 months the rotors warped so I took them in and Napa gave me four new ones but told me to use semi-ceramic pads instead of full-ceramic pads so they won't warp. Well sure enough about a year later my brakes were shaking again so I took the rotors off and look what happened! These are absolute garbage and I'm taking them back to Napa and telling them to give me the thousand bucks back. These are some high quality rotors