Using this fuel system kit is a great way to improve your Subaru's fuel delivery. First, make sure you have the necessary OEM or IAG TGV Housings and injectors as they are required for installation. The pre - assembled fuel lines are made to specific lengths, so installation should be relatively straightforward. Once installed, the Aeromotive regulator will work to keep the fuel pressure and delivery consistent, providing your engine with enough fuel to meet your horsepower demands. This kit is compatible with modern ethanol fuels like E85, so you have flexibility in your fuel choice. As for maintenance, keep an eye on the PTFE hoses. Since they resist heat and corrosion, they should last a long time, but check them regularly for any signs of wear or damage. Also, ensure the regulator is functioning properly to maintain stable fuel pressure.