Radium Top Feed Conversion Fuel Rails | Nissan RB25DET / Mazda 26B (20-0277 / 20-1126)

Side feed injectors are the limit on these engines, and the aftermarket lives on top feed.

Radium Engineering top feed conversion fuel rails for the Nissan RB25DET and the Mazda 26B primary. These convert an engine from factory side feed injectors to top feed, which opens up the far larger top feed injector market and the flow rates that come with it.

Choose Your Engine

• Top feed conversion, Nissan RB25DET (20-0277)
• Top feed conversion, Mazda 26B primary (20-1126)

What You'll Feel

• Access to the full top feed injector market instead of scarce side feed options
• Flow capacity that stops limiting a built or boosted engine
• ORB ports for a regulator, gauge, or pulse damper

Features

• CNC machined billet aluminum, anodized
• Top feed conversion from factory side feed
• AN ORB threaded ports
• Compatible with all fuel types including E85

The Details

A conversion rail changes what injectors you can run, which is the whole point. Side feed injectors are increasingly limited in both availability and flow, while top feed injectors are the industry standard with far more options at every flow rate. Converting means your injector choice is no longer constrained by the factory design.

Note the 26B rail is for the primary injectors specifically; the four rotor 26B runs primary and secondary injection, so confirm which set you are addressing.

Fittings and hose are selected separately, and injector seats or O-rings appropriate to your chosen injectors may be required.

Kit Includes

• Top feed conversion fuel rail with mounting hardware
• NOT included: AN fittings and fuel injectors

Applications

• 20-0277: Nissan RB25DET
• 20-1126: Mazda 26B primary injectors

Important Notes

• These are conversion rails; your injectors change from side feed to top feed
• The 26B rail addresses the primary injectors only
• All fittings sold separately