EBC Brakes have demanded a more aggressive full race material for "track only" use that is not required to bring a vehicle to rest (which Bluestuff NDX was specifically designed to do) and this has led to the development of the EBC Orangestuff brake pads. The EBC Orangestuff brake material will be dusty and slightly more aggressive on brake rotors which is the trade off when using a full race pad. The EBC Orangestuff is a full race material for intermediate to expert drivers for demanding track conditions. Designed from the ground up to meet rigorous track conditions meant hours of testing and formulation from EBC's scientist. DO NOT FIT UPGRADE PADS TO REAR OF VEHICLE UNLESS SAME UPGRADE FITTED TO FRONT, The ?Thermic Black coating? does NOT need to be removed before install. Do NOT use brake cleaner or any other method to remove Thermic Black coating from discs rotors. The Thermic black coating will be removed in the pad swept area by the brake pads with in the first 10 to 20 stops made after installation on the vehicle.The ?Thermic Black coating? is an anti corrosion coating for long resistance against rust. Attempting to remove Thermic Black Coating with brake cleaner or any other method is NOT covered under EBC warranty 2001 thru 2003 SUBARU Impreza 2.0 Turbo WRX (4 Pot Upgrade)