Using this Noble CS style carbon fiber grille is easy. First, you need to remove the bumper cover and the old grille from your 2018 - 2021 Subaru WRX or STI. Then, take the new Noble CS grille and use the supplied hardware to replace the old one. When it comes to maintenance, keep it clean by washing it gently with a mild car wash soap and a soft cloth. Avoid using abrasive cleaners as they can damage the carbon fiber surface. If you notice any issues within the first year, it's covered by the manufacturing defect warranty, so don't hesitate to reach out for support.