Radium Engineering Parts for Subaru WRX and STI
Radium Engineering Parts for Subaru WRX and STI
The Subaru WRX and STI have been the backbone of the Australian performance car scene for decades, and the fuel and oil systems in both the EJ and FA engine families are prime candidates for Radium Engineering upgrades. Whether you are building a street-driven WRX VA on the FA20 or putting together a high-power EJ25 STI for time attack, Radium's precision-machined components deliver the fuel system reliability and blow-by management these engines demand.
EJ20 / EJ25 Fuel Rails & Plumbing
Chicane stocks Radium's full top feed fuel rail range. The top feed conversion rails replace the restrictive factory side-feed system with high-flow rails featuring a 17.5mm internal bore, enabling compatibility with modern high-performance injectors. Multiple versions are available — including the V1-V2 conversion, V3-V6 conversion, and top port upgrade rails. For plumbing, choose between parallel and series fuel rail plumbing kits, both providing all the PTFE hose, fittings, and filtration needed for a complete return-style fuel system. EJ257 injector seats and intake manifold gaskets round out the installation.
Complete Fuel System Builds (WRX/STI 08–21)
The Radium fuel plumbing kit for WRX/STI 08-21 provides everything needed to convert the factory returnless system to a full return-style setup. Pair it with the Radium fuel pump hanger for a complete in-tank pump upgrade supporting single or dual pump configurations, and the RA-Series fuel pressure regulator kit for precise, adjustable fuel pressure management with tool-less adjustment.
FA20 / FA24 Catch Cans (WRX VA & VB)
For the FA20 and FA24 platforms, Radium's dual catch can kits are a critical upgrade. The direct-injection turbo FA engines are notorious for blow-by related carbon buildup on the intake valves, and a properly designed closed-loop catch can system intercepts oil vapour before it reaches the intake tract. Radium's WRX-specific kits mount using factory holes with no cutting or drilling required. Read our catch can vs air oil separator guide for help choosing the right solution for your engine.
Injector Upgrades for Subaru
Upgrading your fuel system often goes hand in hand with larger injectors. If you're stepping up from factory injectors on your EJ or FA build, our Injector Dynamics for Subaru page covers the full ID range from ID1050x through to ID2600x, with fitment for every EJ and FA variant. The injector sizing guide will help you match injector flow rate to your power target and fuel type — particularly important if you're running E85. Pairing Radium fuel rails with Injector Dynamics injectors is one of the most proven combinations in the Australian Subaru scene.
All Radium Engineering components sold at Chicane Australia are 100% genuine, compatible with E85 and race fuels, and ready to ship with fast Australian delivery. Need help speccing a complete fuel system for your build? Get in touch — we can help you select the right combination of rail, plumbing, filtration, and regulation for your power target.
