Using these side splitter winglets is a breeze. First, make sure you have the Flow Design VA WRX/STI side skirt splitters (sold separately) installed on your car. Then, simply bolt the winglets onto the threaded brass fittings of the splitters. You can adjust the winglets from 0mm to 20mm according to your preference. As for maintenance, a simple wash with car - friendly soap and water is enough to keep them clean. Avoid using abrasive materials as the ABS plastic is scratch - resistant but can still be damaged. When installing, take your time to ensure proper alignment and a secure fit. And that's all you need to know to get the most out of your Flow Designs side splitter winglets.