Description
The Radium Engineering Fuel Rail for Mazda 13B Primary Top Feed Conversion is engineered as a purpose-built solution for enthusiasts who want the surrounding system to be easier to package, service and trust under hard use.
Why This Upgrade Matters
Fuel rails become a packaging and flow foundation once an engine moves beyond the limitations of the original fuel system. The goal is not simply a larger rail: the rail must provide the injector interface, port layout and plumbing flexibility needed to build a serviceable, stable fuel system around the engine.
Product-Specific Details
CNC machined fuel rail with direct fitment on the 13B housing. Converts to common top-feed fuel injectors. Fuel rail is equipped with three 8AN ORB ports. Check injector compatibility at Radiumauto.com. CNC Machined from aluminum and compatible with gas and E85.
Fitment & Application
Application: Mazda 13B Primary Top Feed Conversion
Fitment style: Application-Specific
Technical Notes
Radium performance rails commonly use anodized aluminum construction and ORB-style end ports to support configurable AN plumbing. Injector dimensions and sealing style remain application-dependent, so injector selection should be confirmed with the injector manufacturer or tuner.
Radium Part Number
RAD20-0445
Enthusiast Notes
For higher-power or track-focused builds, the real advantage is the freedom to design the rail, regulator, sensor and plumbing layout around the engine instead of being locked into the factory fuel hardware.
Before Ordering
Confirm engine/application, injector dimensions, required adapters, regulator strategy and whether a separate plumbing kit is needed. Fuel injectors and AN adapter fittings are not assumed to be included unless specifically listed for the selected SKU.