Using this APR aerodynamic kit is easy. First, make sure your Subaru WRX/STI (2018 - 2021) is clean before installation. For the Front Air Dam, carefully attach it to the front of your car following the included instructions. Then, install the Side Rocker Extensions along the sides of your vehicle. Finally, put on the Rear Bumper Skirts at the back. When driving, remember that this kit is designed for better high - speed handling, so enjoy the improved performance. For maintenance, regularly clean the kit with a mild car wash soap and a soft cloth. Avoid using abrasive materials that could scratch the surface. If you notice any loose parts, check the fasteners and tighten them as needed.
