Using your Tomioka TD05 - 20G turbo is easy. First, make sure your Subaru is turned off and cooled down. Then, follow the included instructions to bolt on the turbo using the provided hardware kit and gasket. Once installed, start your car and let it idle for a few minutes to allow the turbo to adjust. For the best performance, it's recommended to have a professional tune your vehicle. When it comes to maintenance, check the turbo regularly for any signs of wear or damage. Keep the turbo clean and make sure the oil and coolant levels are always at the right levels. If you notice any unusual noises or a drop in performance, it's best to have a mechanic take a look. And remember, always use high - quality lubricants and follow the recommended maintenance schedule.