Radium - Fuel Rail Plumbing Kit for Subaru EJ Engines

The Radium Engineering Fuel Rail Plumbing Kit for Subaru EJ Engines is engineered specifically to compliment Radium top-feed fuel rail conversions and upgrades on Subaru EJ20, EJ22, and EJ25 turbo engines. Interfacing directly with the factory feed and return hard lines near the left-hand strut tower, this kit provides a complete under-hood plumbing solution including pre-crimped PTFE lines, high-flow distribution fittings, and an adjustable Radium Direct Mount Regulator (DMR).

Plumbing Routing Configurations:

• 20-0978 (Series Flow Plumbing Kit): Feeds the primary fuel rails in series from bank to bank before returning through the regulator. Retains clean, simplified engine bay routing ideal for street, track day, and moderate horsepower setups.
• 20-0984 (Parallel Flow Plumbing Kit): Splits fuel delivery equally to both cylinder banks simultaneously via a high-flow Y-distribution block, returning both rails directly to a dedicated 4-port regulator. Eliminates fuel pressure and volume differentials across cylinder banks, essential for high-horsepower (500+ WHP) and E85 ethanol racing applications.

Key Performance Features:

• Complete Engine Bay Solution: Includes pre-crimped -6AN PTFE fuel lines, -6AN adapter fittings, billet distribution block, and Radium DMR fuel pressure regulator.
• Vapor-Free PTFE Construction: Smooth-bore conductive PTFE inner core wrapped in stainless steel braid and black CPE jacket prevents fuel odor permeation and handles extreme motorsport pressures.
• Direct Strut Tower Interface: Connects directly to OEM Subaru firewall hard lines without cutting or flaring.

Notice: Designed specifically for use with Radium Engineering Subaru EJ fuel rails. Incompatible with factory OEM side-feed fuel rails.