Using these OLM STI V2 spoiler side fins is a breeze. First, make sure your car is a 2015 - 2020 Subaru WRX or STI. Clean the surface of your wing thoroughly before starting the installation. You'll find all the necessary hardware and double - sided adhesive included in the package. Simply use the adhesive to mount the side fins onto the wing. As for the 3M adhesive, try to apply it when the temperature is between 70°F and 100°F (21°C to 38°C) for the best results. After application, give it some time for the bond to strengthen. Don't be in a hurry to drive at high speeds right away. Let it sit at room temperature for at least 20 minutes before you can expect it to have 50% of its ultimate bond strength. For full strength, wait 72 hours. To maintain these side fins, just clean them regularly with a mild car cleaner. Avoid using harsh chemicals that could damage the paint - matched finish. And if you notice any signs of the adhesive starting to loosen, it's a good idea to check the bond and re - apply if necessary.