Using this HT Autos Bottom Line Kit is a great way to enhance your Subaru WRX or STI Sedan. First, gather all the parts in the box: the front splitter, side skirt extensions, and rear lips. Make sure you have all the installation hardware. For installation, it's best to have a professional do it because some modifications might be required. Once installed, enjoy the improved look of your car. When it comes to maintenance, you can clean it with regular car - cleaning products. Avoid using abrasive materials that could scratch the unpainted black finish. Also, be careful when driving to prevent hitting curbs or other objects that could cause dents.