Spool Performance - FX400X Upgraded High Pressure Fuel Pump || B58tu (B58 Gen2)

Spool Performance FX400X High-Pressure Fuel Pump – 350 Bar

🔴 THIS PRODUCT IS CURRENTLY ON BACKORDER
Secure your spot now – ships in the order received.

🚀 Next-Gen Fuel Delivery for S58 and Gen2 BMW DI Engines

Spool Performance proudly introduces the FX400X, our most powerful and advanced high-pressure fuel pump to date. Engineered to deliver 350 bar / 35MPa / 5000 PSI, the FX400X builds upon the foundation of our industry-leading FX350, offering ~20% more flow across the entire delivery range.

This pump is the backbone of any true DI-only high-horsepower build on Gen2 BMW platforms and is fully compatible with our IFX350 Gen2 or IFX150 injectors.

💥 Fueling Capabilities

With FX400X HPFP + IFX350X Gen2 Injectors

• Gasoline: Up to 1100whp

• E50 Mix: Up to 900whp

• E85: Up to 800whp

With FX400X HPFP + IFX150 Gen2 Injectors + Spool Cam Lift Mod

• Gasoline: Up to 1200whp

• E50 Mix: Up to 1050whp

• E85: Up to 900whp

🔧 Plug-and-Play Installation

The FX400X comes as a complete installation kit—no fabrication, no guesswork. Whether you're working on a G80 M3, G87 M2, X3M, or any supported Gen2 BMW platform, installation is seamless.

What’s Included:

• FX400X High-Pressure Fuel Pump

• CNC-Machined Mounting Bracket

• Pump Alignment Tool

• Triple-Layer Low Pressure Line (PTFE core / Stainless Steel / Nylon sheath)

• Plug-and-Play HPFP Adapter Harness

🔬 Engineered for Performance & Reliability

• True 350 Bar Output: Delivers unmatched flow and pressure for high-boost builds

• Precision Construction: High-tolerance components, stainless steel internals, and DLC-coated piston

• E85 Compatible: Fully ethanol-rated for flexibility in tuning

• Lifetime Warranty: Confidence backed by Spool’s industry-leading warranty program

⚠️ Important Note: An upgraded low-pressure fuel pump is required to support the FX400X. Cavitation damage due to inadequate supply pressure is not covered under warranty. Ensure proper low-side fueling for optimal performance and reliability.

🧠 Tuning Support Available

Tuning modifications are required to take full advantage of the FX400X. While platform integrations are in progress, Spool Performance offers direct support for updating your tune files as needed.

🔹 Unlock Your BMW’s True Potential

With the FX400X, you’re not just upgrading a fuel pump—you’re enabling the future of DI-only high-horsepower performance.

Order today to reserve your unit. Backorders ship in order received.