Using the Cobb Tuning Stage 2 Power Package is a great way to upgrade your 2006 - 2007 Subaru WRX. First, carefully follow the included installation guide to install all the components. Make sure to perform the necessary tuning using the COBB Accessport. When using your Subaru, you'll notice an immediate improvement in power and torque. As for maintenance, regularly check the stainless - steel components for any signs of rust or damage. The high - flow filter should be cleaned or replaced according to the manufacturer's instructions. Always keep an eye on the engine temperature, especially with the turbo heatshield in place. If you encounter any issues during installation or use, refer back to the guide or contact our customer service. With proper use and maintenance, this power package will keep your Subaru running smoothly and powerfully for a long time.