Radium Engineering Fuel Rail Plumbing Kit – 99–05 Mazda MX-5

This Radium Engineering fuel rail is a direct replacement for the factory fuel rail found on Mazda 1.6L B6 engines. It features a large 0.69" internal bore for maximum flow, making it ideal for high-performance and forced induction applications. The rail is CNC machined from 6061 aluminum, anodized black for corrosion resistance, and laser etched for a clean finish.

Vehicle Compatibility:

• 1989–1993 Mazda MX-5 Miata

• 1989–1993 Eunos Roadster

• 1993–1999 Mazda Xedos 6

• 1997–2003 Mazda Familia

• 1997–2003 Mazda Etude

• 1997–2004 Kia Sephia

• 1997–2004 Kia Shuma

• 1997–2004 Kia Spectra

Overview:
This billet fuel rail bolts directly to the intake manifold and reuses the OEM plastic spacers to thermally isolate the rail. It supports all fuel types, including alcohol-based fuels like E85. Four ports are provided, allowing flexibility for sensor placement, regulators, and return systems.

Port Configuration:
All four ports are tapped for 8AN ORB threads for secure, leak-free connections.

Available Accessories (sold separately):

• 8AN ORB Adapter Fittings

• 8AN ORB Direct Mount Regulators

• 8AN ORB Fuel Pulse Dampers

• Fuel Pressure Gauge Adapters

If building a custom setup, ensure ample space is available around the rail for mounted accessories. Refer to Radium’s dimensional drawings for clearance.

Fuel Injector Compatibility:
Compatible with factory and OEM-equivalent injectors. For upgraded injectors, consult your injector supplier for compatibility. Radium cannot confirm fitment beyond stating “OEM equivalent.”

Note:
Factory mounting hardware is reused. If installing with OEM lines and regulator, we recommend pairing this with the 20-0769-PK plumbing kit for a bolt-on solution.