XTREME PERFORMANCE brake pads have been designed for drivers seeking high initial bite and friction consistency from low to high temperatures. The XP range is for heavy duty applications, where higher friction levels are required to safely brake under extreme conditions.. We recommend XTREME PERFORMANCE brake pads for street performance and police pursuit vehicles, as well as club track days, heavy towing and upgraded 4WDs.. We recommend use with T3 slotted 4000 & 5000 SERIES rotors for best stopping performance.. XTREME PERFORMANCE part numbers are denoted by the suffix XP.