Radium Fuel Rail — BMW E46 M3 S54 (Rail and Mounting Hardware Only)

This Radium Engineering fuel rail is CNC-machined and anodized aluminium, featuring a large 0.65" internal bore capable of supporting all necessary engine power requirements on the BMW E46 M3 S54. Compatible with OEM and aftermarket direct-fitment fuel injectors, and fully compatible with all fuel types including E85 and all alcohol blends.

End ports are tapped for 8AN ORB (3/4"-16 O-ring) and the centre port is 3/8" NPT female — accepting a wide variety of adapter fittings for custom high-flow fuel system builds with aftermarket regulators and custom fuel lines.

Note: This listing includes the fuel rail and mounting hardware only. Fittings and adapters are sold separately. This option is ideal for custom high-flow fuel system builds using an aftermarket regulator and custom fuel lines.

Suits:

• BMW E46 M3 — S54 engine

Specifications:

• Internal bore: 0.65"
• End ports: 8AN ORB (3/4"-16 O-ring thread)
• Centre port: 3/8" NPT female
• Material: CNC-machined anodized aluminium
• Injector compatibility: OEM and aftermarket direct-fitment
• Fuel compatibility: All fuel types including E85 and alcohol blends
• Fittings: Not included — sold separately

Available Part Numbers:

• 20-0070-02 — Fuel Rail, BMW E46 M3 S54 (rail and mounting hardware only)

Why Radium Engineering?

• ✅ Manufactured in the USA to motorsport-grade tolerances
• ✅ CNC-machined anodized aluminium with 0.65" bore for maximum flow on the S54
• ✅ Trusted by tuners and race teams running high-power BMW E46 M3 builds worldwide
• ✅ 8AN ORB end ports and 3/8" NPT centre port for custom high-flow fuel system flexibility
• ✅ Compatible with E85, ethanol, methanol, pump petrol, and flex fuel sensor integration