Using your Tomioka ball - bearing billet wheel turbocharger is straightforward. First, make sure your Subaru model (either a 2008 - 2014 WRX or a 2006 - 2008 Legacy GT) is turned off and cooled down. Then, install the turbocharger using the included gasket and hardware kit following the standard Subaru 5 - bolt flange type. With the right tune, you'll notice a significant improvement in spooling speed.
When it comes to maintenance, regularly check the actuator pressure. It's set at 1.1 bar / 19 psi, but you can choose the optional 1.3 bar if you prefer. Also, keep an eye on the air flow to ensure the compressor and turbine wheels are working optimally. Make sure to have your turbocharger serviced by a professional mechanic periodically to maintain its performance and reach the maximum power of 480 HP.