Using this turbocharger is a great way to enhance your Subaru STI's performance. First, carefully follow the installation guide that comes with it. It's a tough job, so if you're not experienced, it's better to get help from a professional. Once installed, you'll notice an immediate improvement in your car's power. When driving, enjoy the better throttle response and increased horsepower. For maintenance, regularly check the oil level as the turbocharger has a modified oiling strategy. Also, keep an eye on the gaskets and hardware to make sure they're in good condition. If you hear any strange noises or notice a drop in performance, it might be time to have it checked out.