Radium Engineering Fuel Rail Plumbing Kit Series Subaru WRX 2002-2014 / STI 2004-2021

Part #: 20 - 0578. Radium Engineering's plumbing kits are crafted to enhance Radium Engineering Subaru EJ fuel rail installations. They connect with the factory feed and return hard lines in the engine bay near the LH strut tower, providing all under - hood fuel plumbing. The kit includes all necessary fittings, hoses, and an adjustable high - flow fuel pressure regulator. There are two kit options: one for series - feeding the fuel rails and another for parallel configuration. Both work equally well, and the choice depends on personal preference. Scroll down for more details. These kits are compatible with all Radium Fuel Rails for Subaru EJ engines (except 20 - 0499 Fuel Rails). Important notes: 1. The kit doesn't include a fuel filter. 2. It's not compatible with Radium dual - port injector fuel rail kit 20 - 0499. 3. It's safe to use with alcohol fuels like methanol, ethanol, E85, etc. 4. It uses 3/8' (6AN) high - pressure EFI fuel hose. The 20 - 0578 kit fits all Impreza (WRX/STi) platforms with an EJ motor. For early vehicles with an engine - bay - mounted fuel filter, check the installation instructions. It connects to the factory hard lines near the LH strut tower via SAE quick - connects or older hose - barb connections. It comes with an adjustable Radium Direct Mount Regulator (DMR) and a Radium 0 - 100psi fuel pressure gauge. The gauge can be installed at any 6AN junction before the regulator using the included adapter. The 6AN swivel fuel rail fittings have a low profile, perfect for the tight spaces around the EJ motor. The reusable PushLok hose ends allow customization, like adding a flex - fuel sensor, and make installation easy. The included 6AN fuel hose can be cut with standard tools and assembled without special skills. Unlike low - quality rubber fuel hoses that degrade with alternate fuels, this hose is resistant to all fuels, including E85. See the photo below for the contents of the 20 - 0578 kit.

Using this Radium Engineering fuel rail plumbing kit is a breeze. First, if you have an early vehicle with an engine - bay - mounted fuel filter, make sure to check the installation instructions. Connect the kit to the factory hard lines near the LH strut tower. You can use the SAE quick - connects or the older hose - barb connections depending on your vehicle. The kit comes with an adjustable Radium Direct Mount Regulator (DMR) and a fuel pressure gauge. You can install the gauge at any 6AN junction before the regulator using the provided adapter. The 6AN swivel fuel rail fittings are designed for tight spaces, so they'll fit right in. The reusable PushLok hose ends let you customize the kit, like adding a flex - fuel sensor. You can cut the included 6AN fuel hose with standard tools and put it together without any special skills. Just a few important things to note. This kit doesn't include a fuel filter, so you'll need to get one separately. It's not compatible with the Radium dual - port injector fuel rail kit 20 - 0499. And remember, it's safe to use with alcohol fuels like methanol, ethanol, and E85. For maintenance, keep an eye on the hoses and fittings. Since the hose is resistant to all fuels, including E85, it should last a long time. But check for any signs of wear and tear regularly, and replace any parts that look damaged.