CSF Second Fuel Rail Kit for CSF BMW S58/B58 Air-To-Air Manifolds (csf8404)

This is the CSF Second Fuel Rail Kit for CSF BMW S58/B58 Air-To-Air Manifolds. Part csf8404. Fuel rails, lines and regulators feed and control fuel pressure to the injectors.

The CSF "No Limit" B58 & S58 Air-to-Air Billet Manifolds (CSF #8401 & #8402) come with one fuel rail for port injection (for 6 injector setups). For those looking to run dual port injection, CSF offers a second fuel rail kit. The CSF #8404 Fuel Rail Kit comes with all the necessary mounting hardware and features the same -8 ORB fitting as the primary rail. It can be set up as a return or returnless system.

Features and benefits

• CNC machined 6061 Billet Aluminum Made by CPC (Made in Australia)
• For secondary top feed port injection (additional 6 injectors for a total of 12 injectors) on the CSF #8401 and #8402
• Includes Mounting Hardware
• Includes -8 ORB plug for returnless setup

Product details

• Part type: Fuel Rails & Regulators
• Brand: CSF
• Fuel Injector Quantity: 6
• Mounting Hole Quantity: 4
• Mounting Hardware Included: Yes
• Material: 6061-T6 Billet Aluminum
• Grade Type: Performance
• Gasket Or Seal Included: No
• Fuel System Type: Multi-Point Fuel Injection
• Fuel Injectors Included: No
• Fuel Injection Type: Port
• Fittings Included: Yes
• Fitting Thread Type Standard: UNF
• Fitting Thread Size: 3/4" - 16
• Fitting Quantity: 2
• Configuration: One-Piece
• CSF part number: csf8404

Fitment

• Vehicle: BMW M2 (G87), BMW M3 (G80), BMW M4 (G82), Toyota Supra (Mk5)
• Years and trims on file: 2023-2026 BMW M2 Base; 2021-2026 BMW M3 Base; 2021-2026 BMW M3 Competition; 2022-2026 BMW M3 Competition xDrive; 2024 BMW M3 CS; 2021-2026 BMW M4 Base; 2021-2026 BMW M4 Competition; 2022-2026 BMW M4 Competition xDrive; 2025 BMW M4 CS; 2023 BMW M4 CSL; 2024 Toyota GR Supra 45th Anniversary Edition; 2021-2022 Toyota GR Supra A91 Edition; plus 5 more on file
• Application listing: CSF Second Fuel Rail Kit for CSF BMW S58/B58 Air-To-Air Manifolds
• Check the vehicle, model years, engine and trim above against your car before ordering. Not sure? Ask us and we will check it against your VIN.

Shipping & returns

• Orders are processed within 1–3 business days; standard delivery is 3–7 business days within the United States.
• Special order: this item is ordered from the manufacturer after you place your order. It is not shipped from stock and can take several weeks. We email you the expected ship date after you order.
• We currently ship within the U.S. only. See our Shipping Policy.
• 30-day returns on unused parts in original packaging — see our Return Policy.

Installation at Team ANBD

Team ANBD is a performance shop in Andover, New Jersey. We can align or corner-balance the car, and prep track cars. Book an appointment or ask us about installation and fitment before you order.