Using this product is a great way to transform your 4 - door Subaru WRX/STI into a 2 - door. First, you'll need to cut the original quarter panels to fit the new ones provided in the kit. Make sure to measure accurately before cutting. When installing the new rear quarter panels, take your time to ensure they are properly aligned. Since this is a made - to - order product, it will take about 2 weeks for delivery. As for maintenance, keep the panels clean. You can wash them with mild soap and water regularly. Avoid using harsh chemicals as they may damage the panels. If you notice any scratches or dents, address them promptly to prevent further damage.