Using these side skirts is straightforward. They are designed to fit your 2008 - 2014 Subaru WRX / STI like an OEM part. Just follow the installation guide provided. When the package arrives, make sure to thoroughly inspect it for any damages during shipping. If you find any, let us know immediately. For maintenance, clean the carbon fiber side skirts regularly with a mild soap and water solution. Avoid using abrasive cleaners as they can scratch the surface. This will keep your side skirts looking great and in good condition for a long time.