Using this Noble CS carbon fiber grille is a breeze. First, remove the bumper cover and the old grille from your 2018 - 2021 Subaru WRX or STI. Then, use the supplied hardware to replace them with the new Noble CS grille. As for maintenance, keep it clean by gently wiping it with a soft cloth. Avoid using abrasive cleaners that could scratch the carbon fiber. If you notice any issues within the first year, it's covered by the manufacturing defect warranty. That's all there is to it and enjoy the new look of your ride!