Using the Blouch 20G - XT turbocharger is easy. First, make sure your Subaru is turned off and cooled down. Install the turbocharger as a bolt - on unit using the provided steel oil drain tube, coolant lines, turbo mounting gaskets, and adjustable upgrade actuator. Once installed, start your car and let it idle for a few minutes to ensure proper oil circulation. When driving, gradually increase the speed and boost to avoid sudden stress on the turbo. As for maintenance, regularly check the oil level and quality, as the turbocharger relies on good lubrication. Inspect the coolant lines for any signs of leaks. Every few months, visually examine the turbo for any signs of damage or wear. If you notice any strange noises or a decrease in performance, it's best to have it checked by a professional mechanic.