Using the Noble 300 Series Carbon Fiber Touring Wing on your 2015 - 2021 Subaru WRX or STI is a great way to enhance your car's look and performance. For the STI version, if your car had a factory large spoiler, installation is straightforward. Just remove the old one and match the hardware with the holes. If not, you'll need to drill some holes and get a few extra nuts. The WRX version needs some drilling. First, assemble the wing and cover the install area with painter's tape. Then, lift it up to see how it fits and adjust the position until you're happy. Mark the holes, take the wing off, drill, and then install. When it comes to maintenance, regularly clean the carbon fiber surface with a soft cloth and a mild cleaner. Avoid using abrasive materials that could scratch the surface. Also, keep an eye on the hardware to make sure it's tight and in good condition. And remember, check the warning link (http://www.p65warnings.ca.gov) for any potential safety concerns.