Using your APR Side Rocker Extensions is straightforward. First, gather all the mounting hardware that comes with the product, which includes screws, nuts, and washers. Make sure your car is parked on a flat surface and the area where you'll install the extensions is clean. Then, align the extensions with the designated spots on your 2015 - 2021 Subaru WRX or STI. Secure them in place using the provided hardware. When driving, these extensions will work automatically to reduce lift and improve handling. As for maintenance, regularly clean the carbon fiber with a mild soap and water solution. Avoid using abrasive cleaners that could scratch the surface. Also, check the mounting hardware periodically to ensure it's tight and secure.