Using these DBA rotors is straightforward. Just install them as you would with any standard rotor on your 2004 - 2007 Subaru Impreza WRX STI or 2007 Subaru Impreza WRX STI Limited. When braking, you'll notice the improved performance due to the high - carbon alloy and special ventilation design. For maintenance, regularly check the rotors for wear and tear. Clean them occasionally with a mild brake cleaner to keep them in good condition. Avoid harsh chemicals that could damage the surface. If you notice any unusual noises or vibrations during braking, it's a good idea to have the rotors inspected.