These carbon fiber and kevlar hood dampers are a great addition to your Subaru WRX or STI. To install them, simply grab a screwdriver and use it to swap out the old struts with these new ones. They're held in place by a locking tab at each end. When you're putting them in, make sure the carbon kevlar tubes are closest to the hood and not near the fender. These dampers are sold in pairs. As for maintenance, keep them clean from dirt and debris. You can use a soft cloth to wipe them down regularly. If you notice any issues like loss of pressure or strange noises, it might be time to check them for replacement. Enjoy the improved style and reliability these dampers bring to your car!