Using these exhaust hangers is easy. Just replace your old factory - installed hangers with these Cusco ones. Make sure to install them firmly to ensure proper performance. When driving, you'll notice a big difference in reducing exhaust noise. As for maintenance, there's not much you need to do. Regularly check the hangers for any signs of wear or damage. If you see cracks or the rubber seems too soft, it's time to replace them. Keep in mind that these hangers are designed for specific Subaru models from 2002 - 2007, so make sure your car is compatible before installation.