Using these fender flares is a great way to upgrade your Subaru WRX or STI. First, gather all the hardware that comes with the set. Since professional installation is recommended, it's best to take your car to a mechanic or someone with experience in auto parts installation. They'll ensure the flares are properly fitted and aligned. When it comes to maintenance, simply wash the fender flares with mild soap and water regularly. Avoid using harsh chemicals as they can damage the polyurethane material. Also, check the hardware periodically to make sure it's still tight and secure. Remember, some modifications might be necessary during installation, so be prepared for that process.