Using this Rally Innovations Rear Splitter is easy. First, make sure your vehicle is clean where the splitter will be installed. Then, use the simple bolt - on method to attach it to your Subaru WRX or STI. Remember, a signature is needed when the product is delivered. As for maintenance, you can regularly wash it with mild soap and water to keep it looking good. Since it has a powder - coated finish, avoid using harsh chemicals that could damage the coating. Also, keep an eye on it during normal use. If you notice any signs of excessive wear or damage, it might be a good idea to check it further. With proper use and care, this rear splitter will enhance your vehicle's style for a long time.