Using these front splitter extensions is easy. First, use the provided fitting kit to bolt the extensions directly onto the Flow Designs Subaru VA WRX & STI front lip splitter. You can adjust each side to a length between 5mm and 20mm to suit your needs. When it comes to maintenance, simply use a mild soap and water to clean the textured ABS plastic. Avoid using abrasive cleaners as they may scratch the surface. If you need to make any adjustments later, you can easily loosen the bolts and re - position the extensions. Keep in mind that while the plastic is scratch - resistant, try to avoid rough contact with sharp objects to maintain its appearance.