Using this ETS Stock Replacement Manifold is straightforward. First, make sure your car is a 2022 - 2025 Subaru WRX with the FA24 engine. Then, follow the standard installation procedures for replacing an exhaust manifold. When driving, you'll notice an immediate improvement in your car's performance. As for maintenance, keep an eye on the manifold for any signs of damage or wear. Since it's made of 304 Stainless Steel, it's pretty durable, but it's still a good idea to clean it occasionally with a mild automotive cleaner. If you live in an area with harsh weather conditions, it's recommended to check the manifold more frequently to ensure it stays in top shape.