Using these side splitters is easy. First, make sure your Subaru WRX or STI is parked on a flat surface. Then, simply bolt the side splitters onto the designated spots on your vehicle. It's recommended to use basic tools and follow the installation guide carefully. When it comes to maintenance, you can wash the side splitters with mild soap and water. Avoid using abrasive cleaners as they may damage the powder - coated finish. Also, be aware that a signature is needed when the package is delivered, so make sure someone is available to sign for it.