Using these Flow Designs front splitter extensions is easy. First, make sure you have the Flow Designs Subaru VA WRX & STI front lip splitter installed on your car. Then, use the provided fitting kit to bolt the extensions onto the splitter. You can adjust the width of the extensions anywhere from 5mm to 20mm on each side to get the look and performance you want. When it comes to maintenance, simply wash the extensions with mild soap and water. Avoid using abrasive cleaners as they can scratch the textured ABS plastic. If you notice any loose bolts, tighten them regularly to keep the extensions securely in place.