Using this exhaust cover is easy. First, make sure your Subaru WRX or STI is from 2015 - 2021. Then, choose whether you need the left - hand or right - hand cover. Installation should be straightforward, but if you have any issues, it's a good idea to consult a professional. As for maintenance, just clean it regularly with a mild soap and water solution. Avoid using harsh chemicals as they may damage the ABS material. Remember, it has a 1 - year warranty against manufacturer defects, so if you notice any problems during this period, contact the manufacturer.