Radium Auto Big Bore Fuel Rails for 2001-08 S54 BMW M3/Z3 M/Z4 M [E46/E36-7/E85]

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Radium Big Bore Fuel Rail for 2001-08 S54 BMW M3/Z3M/Z4M [E46/E36-7/E85/E89]

This big bore fuel rail is machined, polished, laser etched and then anodized for a stealth surface finish. It is compatible with OEM and aftermarket fuel injectors. It features a large 0.65"" internal bore with 3/4""-16 female threads (-8AN O-ring port) at each end to accept a variety of adapter fittings for custom high flow fuel system builds. It is compatible with all fuel types including popular alcohol mixtures such as E85. This means you can get your inner Xzibit on, and run E85 in your E85.



For These S54 Vehicles:

  • 2001-2006 BMW M3
  • 2001-2002 BMW Z3 M Coupe
  • 2001-2002 BMW Z3 M Roadster
  • 2006-2008 BMW Z4 M Coupe
  • 2006-2008 BMW Z4 M Roadster



All configurations include a 3/8"" NPT plug for the center port and a 3/4""-16 plug for the front port. Also included are stainless steel mounting tabs and hardware preassembled using aluminum rivet nuts.


OEM Configuration

This configuration includes all the parts required to replace the OEM fuel rail. A -6AN adapter and E85 compliant -6AN PTFE replacement fuel feed hose is included which connects to the BMW fuel pressure regulator using a billet adapter, as shown below. This is an excellent direct bolt-in upgrade for a stock or slightly modified fuel system.

Aftermarket Configurations
Aftermarket configurations are available for flexibility when plumbing a custom high flow fuel system. The pair of adapter fittings are available in -6AN, -8AN, and -10AN. This is intended to be used when building a high horsepower fuel system using aftermarket pumps, hose, and fittings. This option includes two adapters but does not include a feed hose. If your system will be plumbed as a dead end like the BMW rail, only one of these fittings will be used and the included plug (or optional fuel pressure gauge) will be used for the other end of the rail. Professional installation is suggested when building a high flow fuel system.

Optional Add-Ons



Front Port: 
The front port of the Radium fuel rail is machined with 3/4""-16 (-8AN) threads. Instead of using the included plug, a billet aluminum adapter can be installed enabling the use of a Radium fuel pressure gauge, as shown. More info on the Radium Fuel Pressure Gauge can be seen HERE.


Center Port: 
A 3/8"" NPT port is machined in the center port.  A standard 3/8"" NPT plug is included with the kit. However, an optional fuel pulse damper can be installed alternatively. A pulse damper absorbs injector pulses which can cause fluctuation in fuel pressure, especially with high flowing aftermarket fuel injectors.

ModBargains Installation

Questions about this Big Bore Fuel Rail for S54 Powered BMWs from Radium Engineering? Our Modification Experts are standing by and available to help you, online or by calling 714-582-3330. ModBargains also offers expert installation and can install this upgrade for you. Call today!


Mod Category:
Mod Subcategory:
Fuel Components / Management