Using this Radium fuel hanger plumbing kit is easy. First, make sure your vehicle is one of the compatible models: 2008 - 2018 Subaru Forester XT, 2008 - 2021 Subaru WRX, or 2008 - 2021 Subaru STI. Install the Radium in - tank fuel hanger with the help of the included high - flow feed and return lines. Connect the 8AN PTFE feed line from the hanger to the fuel filter under the vehicle, then attach the 8AN rubber hose from the filter to the fuel rails. Connect the 6AN rubber return hose from the fuel pressure regulator back to the pump hanger, and use the billet aluminum retainers to secure the lines. It's important to note that aftermarket fuel rails and a fuel pressure regulator are recommended for better performance. For maintenance, check the fuel filter regularly. Since all components are E85 - safe, you can use E85 fuel without worry. The stainless - steel hoses and the filter bracket that doesn't require drilling or permanent modifications make it a durable and convenient option for your vehicle.