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

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$300.00
$300.00
Shipping calculated at checkout.
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Question about this product?

We're happy to help.

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.

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

This Part Fits:

Year Make Model Submodel
2023-2026 BMW M2 Base
2023-2026 BMW M240i Base
2022-2026 BMW M240i xDrive Base
2021-2026 BMW M3 Base
2021-2026 BMW M3 Competition
2022-2026 BMW M3 Competition xDrive
2024 BMW M3 CS
2020-2024 BMW M340i Base
2020-2024 BMW M340i xDrive Base
2021-2026 BMW M4 Base
2021-2026 BMW M4 Competition
2022-2026 BMW M4 Competition xDrive
2025 BMW M4 CS
2023 BMW M4 CSL
2021-2024 BMW M440i Base
2022-2024 BMW M440i Gran Coupe Base
2021-2024 BMW M440i xDrive Base
2022-2024 BMW M440i xDrive Gran Coupe Base
2020-2024 BMW X3 M
2020-2022 BMW X3 M Competition
2020-2025 BMW X4 M
2020-2022 BMW X4 M Competition
2022-2026 BMW Z4 M40i
2024 Toyota GR Supra 45th Anniversary Edition
2021-2022 Toyota GR Supra A91 Edition
2023 Toyota GR Supra A91-MT Edition
2020-2026 Toyota GR Supra Base
2020 Toyota GR Supra Launch Edition
2026 Toyota GR Supra MkV Final Edition
2020-2026 Toyota GR Supra Premium
CSF Second Fuel Rail Kit for CSF BMW S58/B58 Air-To-Air Manifolds

$300.00

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    Checkout was quick and straightforward. My order confirmation came through instantly, and everything arrived exactly as expected.

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    Portland, Oregon

  • Great value

    Really pleased with the quality for the price. The product felt premium, worked perfectly out of the box, and was well packaged.

    Jamie Carter
    Manchester, England

Can I return a part after it has been installed?

Generally, installed or used performance parts cannot be returned. We strongly recommend verifying vehicle fitment and inspecting the product before installation.

Can I cancel my order after it has been placed?

We begin processing orders as quickly as possible. If you need to cancel, contact us immediately. Once an order has entered fulfillment, been submitted to a supplier, or shipped, cancellation may no longer be possible.

Will this part fit my vehicle?

Fitment varies by year, make, model, trim, engine, and drivetrain. Use our vehicle fitment information to confirm compatibility. If you're unsure, contact us with your VIN and we'll help verify fitment before you order.

How do I know if this is the right upgrade for my build?

Not every upgrade makes sense for every vehicle or build. Tell us your vehicle, current modifications, and performance goals, and we'll help determine whether this product is a good fit.

Are the products you sell authentic?

Yes. We source products through established manufacturers and authorized distribution channels. We do not sell counterfeit or imitation performance parts.

Is professional installation recommended?

For most performance components, yes. Proper installation is critical for fitment, reliability, and performance. Some products may also require specialized tools, programming, tuning, or additional supporting modifications.