Radium Engineering designed the Nissan S14/S15 SR20DET Fuel Rail Kit as a purpose-built solution that upgrades fuel delivery at the engine with higher-flow rail hardware and application-specific plumbing for the named platform. It is aimed at builds using larger injectors, higher fuel demand, or AN-based feed and return plumbing that the factory rail arrangement was not designed to support.

For Nissan S14/S15 SR20DET, it is intended to integrate with the vehicle-specific layout rather than serve as a universal substitute. Injector height, upper/lower O-ring diameter, and plumbing requirements vary by engine. Match the exact application and injector configuration.