Using this Aeromotive fuel rail kit is straightforward. First, gather all the components from the box. Mount the CNC - machined billet fuel rails using the custom steel mounting brackets. Connect the stainless steel braided fuel lines to the appropriate fittings. Install the billet adjustable regulator or fuel pressure sensor adapter as needed. Ensure all ORB - Port fittings with O - rings and billet aluminum AN - hose ends are properly tightened. When it comes to maintenance, regularly check for any signs of leaks in the fuel lines and fittings. If you notice any issues, replace the O - rings or other damaged parts promptly. Keep the fuel rails clean to prevent any debris from affecting the fuel flow. And always follow the vehicle's manual for any specific fuel system requirements. Remember, this kit is designed for the 2004 - 2006 Subaru 2.0L WRX Return - Style System, so make sure your vehicle model matches before installation.