Using your StopTech C - TEK front brake rotor is easy. Just install it like you would with a regular brake rotor on your 2015 - 2021 Subaru WRX. Make sure to follow the standard installation procedures provided in your vehicle's manual. When it comes to driving, you'll notice a smooth and consistent braking experience. For daily driving, this rotor will serve you well. As for maintenance, keep an eye on the rotor's surface. If you live in a temperate climate, the non - coated design means less worry about salt damage, but still, check for any signs of wear or damage regularly. If you notice any strange noises or reduced braking performance, it's a good idea to have it inspected. Also, make sure to clean the rotor periodically to keep it in good condition.