Using this fuel rail kit is straightforward. First, make sure your vehicle is the right model (2004 - 2006 Subaru 2.0L WRX for return-style systems, or WRX 2002 - 2014 / STI 2007 - 2016). Then, follow the installation steps carefully. Attach the CNC - machined billet fuel rails using the custom steel mounting brackets. Connect all the fittings and hoses properly. When it comes to maintenance, regularly check the stainless steel braided fuel lines for any signs of wear or damage. Also, ensure that the O - rings on the ORB - Port fittings are in good condition. If you notice any fuel leaks or pressure issues, stop using the vehicle and have it checked by a professional. This way, you can keep your fuel rail system working well for a long time.