The Raceworks Billet Fuel Rail Kits for Mazda 13B rotary engines are engineered to provide consistent, high-flow fuel delivery for performance street cars, track builds, and serious motorsport applications. CNC machined from billet aluminium, these fuel rails improve internal flow and ensure even fuel distribution across all injectors, which is critical for rotary engines operating under high load, boost, and sustained RPM. Compared to factory rails, Raceworks billet rails offer superior strength, flow capacity, and reliability for modified 13B setups. Finished in a black anodised coating, these fuel rails provide excellent corrosion resistance and a clean, professional appearance suitable for engine bays and race environments. This listing combines multiple 13B-specific fuel rail variants under one product, allowing you to select the correct option for your rotor housing and intake configuration. Variant Fitment Guide 13B S4 / S5 (ALY-019BK)Suits Series 4 and Series 5 13B engines, commonly found in FC RX-7 platforms using the factory-style intake and injector arrangement. 13B S6–S8 (ALY-020BK)Designed for Series 6, 7, and 8 13B engines, typically used in FD RX-7 platforms with revised intake and injector positioning. Key Features Suits Mazda 13B rotary engines CNC machined billet aluminium fuel rail Improved fuel flow and injector distribution Designed for aftermarket injector and fuel system upgrades Supports high-performance and high-horsepower rotary builds Black anodised finish for durability and corrosion resistance Suitable for performance street, track, and motorsport use Fitment Notes These fuel rails are engine and series specific and must be matched to the correct 13B variant. Please ensure you select the correct option based on: Engine series (S4-S5 / S6-S8) Intake manifold configuration Injector type and positioning If you’re unsure which fuel rail suits your setup, please contact us before ordering and we’ll be happy to help confirm compatibility. Typical Applications Mazda RX-7 performance builds Turbocharged rotary engines High-flow injector fuel systems Track day and motorsport vehicles Availability & Lead Time Raceworks offer an extensive range of fuel system and performance components. As a result, some items may be supplied to order rather than held on the shelf. Lead times can vary. If your order is time-sensitive, please contact us before purchasing so we can confirm current availability.
