Radium Engineering Fuel Rail Plumbing Kit – Subaru EJ Parallel Setup (EJ20/EJ25)

This Radium Engineering plumbing kit is designed for Subaru EJ engines using the Radium fuel rails in a parallel configuration. Ideal for high-performance builds, the parallel layout feeds each rail independently from the regulator, ensuring consistent fuel delivery across all cylinders.

Overview
This kit simplifies the engine bay by consolidating hoses and fittings. The included RA-series MPR fuel pressure regulator mounts cleanly to the LH strut tower using a dedicated stainless steel bracket. Fuel enters the regulator from the rear and exits through the front ports to feed each fuel rail.

A 0–100 psi Radium fuel pressure gauge is included for precise calibration. The kit also provides all necessary fittings and 6AN hoses to interface with OEM hard lines. For vehicles using aftermarket -AN fuel lines, contact Radium for compatible options.

Key Features

• Parallel fuel rail configuration for even fuel distribution

• MPR-RA adjustable fuel pressure regulator

• 0–100 psi Radium fuel pressure gauge

• Stainless steel bracket for strut tower mounting

• High-quality -6AN hoses and fittings included

• Compatible with OEM hard lines

• E85 and alternative fuel compatible

Vehicle Compatibility

• 08–14 Subaru Impreza STi

• 15–21 Subaru STi