Radium Engineering Fuel Rail Kit | 1999-2005 BMW M3 (20-0070-02)

The S54 revs to eight grand across six individual throttles; its rail should keep up.

The Radium Engineering Fuel Rail Kit for the 1999-2005 BMW M3 upgrades delivery on the E46 M3's S54: a CNC machined aluminum high flow rail, anodized and laser etched, replacing the OEM rail with a large internal bore supporting all necessary engine power requirements and ORB porting for regulators, dampers, and gauges. Factory injector compatibility keeps the install bolt-on, and all fuel types including E85 are welcome.

What You'll Feel

• Fuel delivery headroom for supercharged and built S54 engines
• Consistent injector supply across six cylinders at sustained high rpm
• ORB ports opening dampers, gauges, and regulator options
• E85 confidence from the anodized aluminum construction

Features

• High flow fuel rail kit for the 1999-2005 BMW M3 (E46, S54)
• CNC machined aluminum, anodized, laser etched; large internal bore
• Threaded ORB ports for feed and accessories
• Upgrade rail: OEM or OEM-equivalent injectors only (matching height and O-ring specs)
• All fuel types including E85; plumbing sold separately

The Details

The S54's individual throttle bodies make fuel delivery consistency audible, with any pressure sag reading as a stumble across the ITB symphony, and the large-bore rail is the fix at the source: even supply to all six injectors regardless of what the pump and regulator are doing upstream. Supercharger kits, the platform's favorite power adder, multiply the demand this rail was sized for. Plumbing configures per your system through the ORB ports, the 20-0429 filter kit finishes the delivery path, and the injector rule is Radium's standard, OEM-equivalent dimensions confirmed with the manufacturer.

Kit Includes

• 1x Anodized, laser etched high flow fuel rail with mounting hardware
• Injectors and plumbing sold separately

Applications

• 1999-2005 BMW M3 (E46, S54) per the store listing; verify Radium's model-year fitment