Using this D2 Racing RS Coilover Kit is easy. First, make sure your car is on a flat and stable surface. Adjust the height and preload according to your driving needs. You can fine - tune the 36 - way dampener and rebound settings for different road conditions. When installing, follow the instruction manual carefully. As for maintenance, check the mounts regularly for any signs of wear or damage. Keep the threads clean to avoid rust. If you notice any issues, it can be rebuilt and serviced in the US. Also, make sure to use the kit only on compatible 2008 - 2014 Subaru WRX models.