Using these Seibon side skirts is simple. Just have them installed by a professional to ensure a proper fit on your 2008 - 2014 Subaru Impreza WRX STI or 2011 - 2014 WRX Hatchback. When your order arrives, make sure to carefully inspect the package for any signs of damage. If you spot any, let us know immediately. Since these are made of carbon fiber, to keep them looking great, clean them regularly with a mild soap and water solution. Avoid using abrasive cleaners as they can scratch the surface. And remember, if you pre - order, it'll take about 8 - 12 weeks for them to be built, so plan ahead.