Home » AEM Electronics 25-111BK High-Volume Fuel Rail (K20 High Flow) – Extreme Performance for Honda Civic Si and Acura RSX
AEM K20 Fuel Rail - RO34 Performance Parts
AEM K20 Fuel Rail - RO34 Performance Parts
AEM

AEM Electronics 25-111BK High-Volume Fuel Rail (K20 High Flow) – Extreme Performance for Honda Civic Si and Acura RSX

In stock
(0)
€99,70
  • American Express
  • Apple Pay
  • Bancontact
  • Google Pay
  • Klarna
  • Maestro
  • Mastercard
  • Shop Pay
  • Union Pay
  • Visa
Guaranteed OEM-grade fitment
Dispatched from Spain in 24–48h
Easy 30-day returns
Ships from Spain in 24–48h. International delivery times vary.
OEM-grade quality & guaranteed fitment.
Expert support — ask us before you buy.

Questions about this product?

Ask an expert!

Guaranteed Fitment
Secure Checkout
24–48h Dispatch (Spain)
Easy Returns

The AEM Electronics 25-111BK is a high-flow fuel rail specific to Honda K20 engines. Designed to eliminate the restrictions of the original system and stabilize fuel pressure, this rail is the direct solution for high-power builds, turbo projects, and competition.

Features

  • 12.7 mm (0.5") internal diameter — Massive fuel flow that prevents pressure drops at high RPM.
  • Supports over 1000 HP — Ample capacity for turbo, supercharged, or heavily built naturally aspirated engines.
  • Integrated 1/8" NPT port — Allows you to connect a fuel pressure gauge or nitrous line without adapters.
  • 6061-T6 aluminum construction — Precision CNC-machined, strong, and extremely lightweight.
  • Laser-etched black anodizing — Corrosion protection and a durable finish, compatible with E85 fuels.

Technical specifications

  • Material: 6061-T6 aerospace aluminum
  • Finish: Black anodized with laser-etched logo
  • Connections: -6 AN and 9/16"x18
  • Injector compatibility: OEM and high-flow
  • Includes: Complete mounting kit, O-rings, and necessary hardware

Compatibility

Compatible models:

  • Honda Civic Si (2002-2005)
  • Acura RSX Base and Type-S (2002-2006)

Engines:

  • K20 series (K20A, K20A2, K20A3, K20Z1)
  • K-Swap conversion applications using a K20 engine

Why choose AEM

Unlike original rails, which suffer flow restrictions and pressure fluctuations at high RPM, the AEM 25-111BK acts as a pulse damper, stabilizing fuel supply under maximum demand. Compared to generic alternatives, AEM guarantees precise machining tolerances, a perfect seal, and a surface treatment that resists corrosion from modern fuels, including E85.

Frequently asked questions

  • Does it require modifications to install? No, it is a direct (bolt-on) replacement. Everything is included in the box.
  • Is it compatible with E85? Yes, the anodizing protects the aluminum against ethanol corrosion.
  • Can I use my original injectors? Yes, it is compatible with OEM and aftermarket high-performance injectors.

Shipping and warranty

Product in stock. Fast and secure shipping. 100% fitment guarantee for K20 engines.