Using your Tomioka TD06 - 20G turbocharger is straightforward. First, make sure to install all the parts from the kit correctly. The turbocharger, actuator, oil and water pipes, gaskets, and hardware kits should be fitted according to the instructions. When starting your Subaru WRX or STI, let the engine warm up for a bit before driving hard. This helps the turbocharger work smoothly. Since this turbo can handle up to 420 HP, remember that upgrading your engine internals is a must for the best performance and to avoid any damage. For maintenance, regularly check the oil and water pipes for any leaks. Also, keep an eye on the gaskets and hardware to ensure they're in good condition. If you notice any issues, get them fixed right away to keep your turbocharger running well.