Hawk brake pads for the rear of the 99+ Mustang GT. Huge increase in stopping over stock and most aftermarket pads. These are the autocross compound so you should use the matching Hawk compound on the rear. This compound will make a lot of squealing on low speed stops and will create a lot of brake dust. These pads are a great choice for autocross and Solo 1, if you are doing road race events with more than 5 laps per session you should consider the Hawk blue or HT10 black compound .