Radium Top Feed Secondary Fuel Rail Conversion Kit | Mazda 13B-REW (20-0447)

The secondaries carry the 13B-REW's top-end fuel load, and one rail now covers every manifold that feeds them.

The Radium Engineering Top Feed Secondary Fuel Rail Conversion Kit for the Mazda 13B-REW is the adaptable half of the rotary conversion: with the provided 2AN ORB plugs, the design permits both the OEM 2-port intake manifold and aftermarket 4-port intake manifolds from one rail. Anodized black aluminum with a large internal bore supporting all necessary engine power requirements, three 8AN ORB ports with the extra center port hosting the OEM fuel temperature sensor (via 14-0421), a pressure transducer, or a pulse damper. Insulating spacers, washers, stainless hardware, and stainless M8 extension mounts are included, along with 14mm lower injector seats carrying FKM O-rings for boosted duty, compatible with or without the OEM diffusers. Injectors sold separately.

What You'll Feel

• Top-end fueling headroom on the injectors that come alive when a REW makes real power
• One rail serving OEM 2-port and aftermarket 4-port manifolds via the included plug strategy
• Boost-sealed injector bases from the FKM O-ring seats
• Corrosion-proof mounting from the stainless M8 extension mounts
• The OEM fuel temperature sensor retained on converted systems

Features

• High flow secondary rail for the 13B-REW; converts to top feed injection
• Adaptable design: OEM 2-port manifold (20mm insulating spacers, billet seats, 2AN ORB plugs) and aftermarket 4-port manifolds (Xcessive uses the 11mm spacers) supported
• Anodized black aluminum, large internal bore, all fuels including E85
• 3x 8AN ORB ports; center port for the OEM fuel temp sensor (14-0421), transducer, or damper
• 14mm lower injector seats with FKM O-rings, compatible with or without OEM diffusers; 2x stainless M8 extension mounts
• Verified injectors: ID1050/ID1300/ID1700/ID2600-XDS-60-14-14 (NOT included)

The Details

Two compatibility notes from Radium determine the parts list. On the OEM 2-port manifold, the required space means an air control valve delete for the OEM 13B-REW intake manifold is required, Radium's 20-0449, sold separately. On an Elite Rotary Shop 4-port manifold, 2 extra injector seats are required beyond the included set, purchased separately, while the Xcessive 4-port simply uses the included 11mm spacers. With this rail, all lower intake manifold variations converge on the same verified injector list, the ID XDS-60-14-14 family, which keeps injector planning simple regardless of manifold path. Plumbing and crossover to the primary rail run through 8AN ORB adapters selected per your system, with O-rings lubricated at every install step.

Kit Includes

• 1x Black anodized high flow secondary fuel rail
• 14mm lower injector seats with FKM O-rings; billet seats and 2AN ORB plugs for OEM manifold use
• 20mm and 11mm insulating spacers, washers, stainless hardware, 2x stainless M8 extension mounts
• Injectors, port fittings, ACV delete (20-0449), and extra ERS seats NOT included

Applications

• 1992-2002 Mazda RX-7 FD3S (13B-REW)
• OEM 2-port intake manifold (requires 20-0449 ACV delete) and aftermarket 4-port manifolds (Xcessive; Elite Rotary Shop with 2 extra seats)
• Verified: ID1050/1300/1700/2600-XDS-60-14-14 injectors