Using your Flow Designs side skirts is easy. First, use the included fitting kit to attach the side skirt extension splitters V3 to your Subaru VA WRX/STI. Make sure to follow the instructions carefully to ensure a perfect fit. When it comes to maintenance, a simple wash with mild soap and water is usually enough to keep them looking great. Avoid using harsh chemicals as they may damage the hand - polished satin black finish. Also, be careful when parking or driving over rough terrain to prevent any unnecessary impacts. The 10 - year warranty means you can have peace of mind, but taking good care of your side skirts will keep them in top condition for a long time.