These Seibon carbon fiber side skirts are a great addition to your Subaru WRX or STI. To install them, just follow the standard procedure for side skirt installation. Make sure to clean the area on your car where the side skirts will be attached before you start. When it comes to shipping, remember that because of their size, they'll come via Pilot Freight Services. It might take a bit of time for Seibon to pack and ship them, so be patient. Once you receive them, check for any damage right away. If you find any issues, tell us immediately. Since these side skirts are made of carbon fiber, they're quite durable. But to keep them looking good, clean them regularly with a mild soap and water solution. Avoid using harsh chemicals that could damage the carbon fiber. And if you pre - order, just know that it takes about 8 - 12 weeks for them to be made, but it's definitely worth the wait for such a high - quality product.