BMW B58 to B58TU HPFP Wiring Harness Extension - Plug & Play Retrofit Loom Adapter for F30 F32 G20 G21 G22 G29 340i 440i M340i M440i Z4 M40i & Toyota GR Supra A90

Direct-Fit HPFP Loom Extension for B58 Engine to B58TU Pump Conversion

Make your B58 fuel system upgrade simple with this plug-in high-pressure fuel pump adaptor lead. This dedicated extension cable connects the original B58 engine harness to the later B58TU pump found on models such as the Z4 M40i and GR Supra A90. No cutting, no soldering and fully reversible. It is a clean, OEM-style solution that supports tuning goals, ethanol blend use and popular Stage 2 to Stage 2 Plus maps.

Why enthusiasts choose this adaptor lead

• True plug-in connector that bridges B58 wiring to the B58TU HPFP
• Quick, tidy install with no wire splicing and no permanent modifications
• Ideal when fitting the Z4 M40i or Supra A90 high-pressure pump to first-generation B58 engines
• Perfect for builds targeting more fuel headroom for mapping, E-blends and future power upgrades

We have fitted this extension on our own projects and many customer cars. Feedback has been consistently positive on fitment, reliability and ease of installation. If you are completing a B58TU pump swap on a B58, this is the hassle-free connector you want in your toolbox.

Vehicle fitment

Engine

• BMW B58 when upgrading to the later B58TU high-pressure pump

BMW 3 Series

• F30 LCI 340i, 340ix (10/2014 - 10/2018)
• F31 LCI Touring 340i, 340ix (10/2014 - 06/2019)
• F34 GT LCI 340i, 340ix (09/2015 - 12/2019)
• G20 M340i, M340ix (01/2018 - 12/2019)
• G21 Touring M340ix (05/2018 - 12/2019)

BMW 4 Series

• F32 440i, 440ix (04/2015 - 02/2017)
• F32 LCI 440i, 440ix (05/2016 - 12/2019)
• F33 440i, 440ix (03/2015 - 02/2017)
• F33 LCI 440i, 440ix (05/2016 - 12/2019)
• F36 Gran Coupe 440i, 440ix (03/2015 - 02/2017)
• F36 Gran Coupe LCI 440i, 440ix (05/2016 - 12/2019)
• G22 M440ix (07/2020)

BMW Z Series

• G29 Z4 M40i (2018 - 2020)

Toyota

• GR Supra A90 6-cylinder (2018 - 2020)

What you receive

• HPFP wiring extension loom for B58 to B58TU conversion

Note: this listing is for the extension harness only. The high-pressure fuel pump is not included.

Fitting and support

Professional installation recommended. For expert fitment and coding advice, book with MJ Modifications in Warwickshire. Request a quote at info@mjmodifications.co.uk.

Built for tuners and daily drivers

This direct-fit pump connector lead keeps the bay looking factory while unlocking the headroom you need for power increases. It is the neat, reliable way to complete a B58TU pump swap on 340i, 440i, M340i, M440i, Z4 M40i and A90 Supra builds running upgraded software and ethanol blends.

Search terms to help you find the right part

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Why buy from MJ Modifications

Trusted by UK enthusiasts, installed on our own builds and loved by customers for a straightforward, OEM-like install and dependable performance. If you are searching for a clean B58TU pump conversion cable for your B58, this plug-in adaptor lead is the proven choice.