Using this StopTech brake rotor is straightforward. Just replace your old factory rotor with this new one following the standard procedures for your 2002 - 2005 Subaru WRX. When installing, make sure to clean the area where the rotor will be placed to ensure a good fit. As for maintenance, regularly check the rotor for any signs of wear or damage. If you notice any unusual noises or vibrations during braking, it's a good idea to inspect the rotor. Also, keep the rotor clean and dry to prevent corrosion. Avoid driving through deep water or mud for extended periods as this can damage the protective coating. With proper use and maintenance, this brake rotor will serve you well and provide reliable braking performance.