Using this Cobb Silicone Turbo Inlet V2 is a great way to enhance your 2008 - 2021 Subaru STI's performance. First, make sure your vehicle is turned off and cooled down before installation. Since it requires tuning, it's recommended to have a professional mechanic handle the installation and tuning process. The turbo inlet should be connected securely to the turbocharger with a 2.4 - inch inlet. After installation, check all connections to ensure there are no air leaks. As for maintenance, regularly inspect the silicone hose for any signs of wear or damage. If you notice any cracks or tears, replace the hose immediately. Also, keep the aluminum adapters clean to maintain a good fit. And remember, every time you work on your vehicle's intake system, it's a good idea to double - check the tuning to make sure your engine is running at its best.