Spool FX-350 HPFP BMW [S58]

QT Parts is a Finnish online store.

Our warehouse is located in Nokia, Finland.

You can collect your order directly from us if needed. Simply select “Pickup” at checkout.

Pay securely with multiple payment methods, including invoice and installment plans through Klarna.

The delivery time for products in stock is 1-5 business days. We ship worldwide.

If the product is not in stock and it is a pre order product, the average delivery time is 5-21 business days. If the product has a longer delivery time than previously announced, we will be in touch. International orders may be subject to VAT, import duties, and customs fees upon arrival in the destination country.

Terms for product returns:

• You must return the ordered products within 14 days of receiving
• The products must be unused and without damages
• Commission fee for handling returns is 21,90€
• For product returns, the customer is in charge of the return costs. Only door to door service (Express)
• Shipping costs are not refunded

For international orders sales are final and non-refundable. Once an order is placed, it cannot be canceled or returned. By placing an order, you acknowledge and agree to these terms.

Return address: QT Parts, Vasarakatu 8B, 37150 Nokia, Finland.

Pre order / made-to-order products

If the product you have ordered is a pre order or made-to-order item, it is not subject to the 14-day right of withdrawal or return under consumer protection laws, as the product is manufactured or sourced specifically based on the customer’s individual order.

If you wish to cancel your order before receiving the product, we will refund 50% of the total order amount.

This condition applies to the following product categories:

• Suspension
• Engine Tuning
• Engine Parts
• Exhaust Systems
• Fueling
• Turbochargers/superchargers
• Drivetrain
• ECE-approved Downpipes

All of the above products are manufactured or sourced individually based on the customer’s order, and therefore cannot be returned after delivery, unless the product has a manufacturing or material defect.

In the event of such a defect, the standard liability for defects as provided by consumer protection legislation shall apply.

Spool FX-350 HPFP Upgrade | BMW S58

The Spool Performance FX-350 is a top-of-the-line High-Pressure Fuel Pump (HPFP) for BMW S58 engines. This solution is specifically designed for high-power direct injection setups, offering up to 50% more fuel than stock pumps and an operating pressure of up to 390 bar.

What is the FX-350?

The FX-350 is a precision-engineered HPFP that combines high pressure, high flow capacity, and excellent reliability.

• Up to 390 bar / 39 MPa / 5600 psi operating pressure
• Approximately +50% more flow compared to OEM pumps
• Stainless steel construction
• DLC coated piston and cylinder
• Full E85 compatibility

Design and Performance

The FX-350 has been specifically developed for the S58 engine's dual pump architecture:

• Optimized for high RPMs and loads
• Smooth and reliable fuel delivery at high pressures
• Designed for DI-only high power setups

When combined with Spool IFX350 Gen2 injectors:

• Allows for very high power without a port injection system
• Resolves the high-pressure side limitations of the S58 platform

Installation

• Fully Plug & Play
• Includes all necessary components for direct installation
• Compatible with supported platforms without modifications

Package Contents

• 2 x FX-350 High-Pressure Fuel Pump
• 2 x Custom mounting brackets
• Pump alignment tool
• Three-layer low-pressure hose
• Plug & Play HPFP adapter harness
• Plug & Play HPFP high-pressure line

Compatibility

• G87 M2
• G20 Alpina B3
• F97 X3M
• F98 X4M
• G80 M3
• G82 M4

Software Requirements

• Requires software changes before commissioning
• Achieves full performance only when properly calibrated
• Spool can assist with implementing the necessary changes

Important Note: LPFP

The low-pressure fuel system is critical:

• An upgraded LPFP is recommended to ensure optimal operation
• Insufficient supply can cause cavitation and damage
• Such damages are not covered by warranty

Warranty

• Lifetime warranty for manufacturing and material defects