Spool Performance Auxiliary Split Fuel System - 2020-2024 BMW M340i, M440i, X3 / X4 M40i (B58 Gen 2)

Spool Performance SKU: SP-B58G2AUXF450
Pump Option
Price
Regular price $1,43200
Regular price Sale price $1,43200
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No inventory information available. Contact us at sales@ossmotorsport.com or 431-831-0100 for details.

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A complete auxiliary fuel system for B58 Gen 2 BMWs running port injection on top of the factory direct injection. It gives the port injectors their own boost-referenced fuel supply, separate from the high pressure DI side, so pressure pulses from the DI pump no longer upset port injector fuelling. The result is steadier, more repeatable fuelling as power climbs.

Features

  • Splits the DI and port injection (PI) feeds so each system runs independently
  • Boost-referenced Radium Engineering fuel pressure regulator for the port injection side
  • Dual Walbro 450 pumps as standard, with a Walbro 525 upgrade option
  • Keeps the OEM fuel pump top hat using precision-machined aluminum fittings: no repinning or factory wiring changes
  • Plug-and-play harness for the Motiv Reflex controller
  • Triple-layer fuel lines: PTFE inner core, stainless steel braid, nylon outer jacket, fully ethanol compatible
  • Check valves included

What's included

  • Dual Walbro 450 or 525 fuel pumps (your choice) with check valves
  • Machined aluminum top hat fittings
  • Radium Engineering fuel pressure regulator
  • Triple-layer PTFE fuel lines and fittings
  • Plug-and-play Reflex wiring harness (standard relay control)

Fitment

  • 2020-2024 BMW M340i / M340i xDrive (G20)
  • 2021-2024 BMW M440i / M440i xDrive coupe, convertible and Gran Coupe (G22/G23/G26)
  • 2020-2024 BMW X3 M40i (G01) and 2020-2025 X4 M40i (G02)
  • Designed for B58 Gen 2 engines with port injection

Installation

Uses the OEM fuel pump top hat with Spool's machined aluminum fittings, with lines run to the port injection side and the regulator. The supplied plug-and-play harness connects to a Motiv Reflex controller.

Good to know

  • Full PWM pump control is possible with Spool's solid-state relay harness, sold separately. Two harnesses are needed per system. Ask us if you want them added.
  • Built around Motiv Reflex control. The Reflex controller is not listed as included, so confirm with us before ordering.
  • The kit comes set up for standard relay pump control.

Spool Performance part numbers: SP-B58G2AUXF450, SP-B58G2AUXF525. Not sure it fits your car? Send us your VIN and we will confirm before you order.

Why buy from OSS Motorsport

OSS Motorsport is a Manitoba performance shop that specializes in European cars, and we can source parts for just about any make. We ship Canada-wide with CAD pricing. Spool Performance parts ship from the US and usually arrive in about 2 weeks, with no duties or brokerage fees to pay at the door. Questions? Email sales@ossmotorsport.com or call 431-831-0100.

Shipping information

In stock at our Winnipeg warehouse: ships in 1 to 3 business days.

In stock in Canada: ships from one of our Canadian warehouses in 3 to 5 business days.

In stock at our US warehouse: we bring it into our Winnipeg warehouse first, then ship it to you. 

This takes about 2 weeks.

Special order: contact us at sales@ossmotorsport.com or 431-831-0100 for an ETA.

Tracking is emailed as soon as your order ships.

Absolutely NO refunds/exchanges on special order items. If return of a non special order item is requested, customer must pay shipping and it must be requested within 14 days of purchase.

Any orders not picked up by the customer within 15 days after notification of arrival becomes property of OSS Motorsport Ltd. no credit or refund will be given.

Customers that remove product(s) from OSS Motorsport will have been deemed to agree with all of the above terms and conditions. All items sold are for Off Road Use Only.

All performance modifications are done at your own risk and may void your warranty.

UNWANTED ITEMS

Unwanted items are subject to a 20% restocking fee, in addition to the return shipping to our warehouse(if applicable). Used items cannot be returned.

Electronics

All Electronics are final sale!

TERMS AND CONDITIONS

Please have your mail box or junk mail box checked for status updates.

Shipments, returns & refund

During the payment process, we provide delivery options with different delivery companies with which we have no contractual relationship. We offer commission free this added service so the client can receive its order without having to round trip to our warehouse. If there is any problem with the delivery, it is the consignee responsibility to contact the delivery company he/she dealt with directly. The carrier provide a limited insurance of 100$. If you need more, please contact us prior to purchase as we will get you the quotation for extra insurance from the carrier you will select.

NO return accepted. Exchange upon approval and proof of factory default.

Partial or full refund requests are subject to 5% administrative fees. Refund is immediately issued upon cancellation and a confirmation email is sent. However, depending on the payment method used, it may take one (1) to ten (10) days for the refund to appear in client account.

Special orders are non-refundable.

Disclaimers:

Some products may be used for off-road only. Customer is responsible to check with his/her local/state laws and ordinances.

We are not responsible if the client ordered the wrong item, which does not work on its vehicle.

All parts required professional installation, there is no return or exchange if the client does not know how to install it him/herself.

OSS Motorsport is not responsible for defective or damage caused by unprofessional installation or misuse of the product.

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Questions about the Terms of Service should be sent to us at sales@ossmotorsport.com.

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