Using the RS - R Sports - I coilover kit is easy. First, make sure your Subaru WRX is from 2015 to 2021 as this kit is specifically designed for these models. You can adjust the ride height and preload according to your needs. For a better daily driving experience, follow the recommended adjustment ranges. When you're going to the track, you can fully utilize the 36 - way adjustable dampers to optimize the performance. As for maintenance, regularly check the upper mounts and dampers for any signs of wear or damage. Keep the kit clean to prevent dirt and debris from affecting its performance. And remember, the kit comes with a 1 - year/12,000 - mile warranty, so if you have any problems within this period, reach out to the manufacturer.