Burger Motorsports (BMS) JB4 Plug & Play Tuning Box for BMW B58 B48 B46 B38 | Piggyback ECU | M140i M240i 220i 230i 320i 330i 330e 340i 440i 540i 740i X3 X4 X5 Z4 | Bluetooth & Data Logging Ready

Unlock serious gains from your turbocharged BMW with the Burger Motorsports JB4 power module. The ultimate remap alternative for B58, B48, B46 and B38 engines, this advanced add-on controller delivers huge increases in horsepower and torque, sharper response and configurable performance maps for daily driving or track use.

At MJ Modifications we run the JB4 on our own cars and our customers rave about the smooth OEM-like drivability, massive mid-range punch and easy control via the app. If you are searching for a BMW power box, ECU upgrade, tuning module, chip tuning alternative, stage 1 stage 2 style performance, or a safe way to wake up your M140i, M240i, 220i, 230i, 320i, 330i, 330e, 340i, 440i, 540i, 740i, X3, X4, X5 or Z4 without a bench flash, this is the proven choice.

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Why enthusiasts choose this JB4 performance module

• Big power on pump fuel. Typical gains up to 80 whp on B58 and up to 40 whp on B48 on standard cars. Even more with supporting hardware, higher octane, ethanol blends and upgraded turbos.
• Simple installation with a dedicated harness. Fully reversible with no permanent changes and not VIN locked, so you can remove or resell later.
• Up to eight selectable maps for different fuels and hardware. Cruise like stock when you want, unleash serious performance when you need it.
• Deep CAN OBD integration for features you do not get with basic tuning chips: boost by gear, in-cluster gauge hijack options, exhaust valve control, water meth support, built-in data logging and fault code read and clear.
• App and laptop connectivity. Add the Bluetooth Connect Kit for smartphone control or use the BMS Data Cable on a Windows laptop for logging, map changes and free firmware updates.
• Rugged billet aluminium enclosure. Made in the USA with a 5 year BMS repair warranty for long-term confidence.

Looking for a BMW B58 power upgrade, M140i power box, 340i tuning solution, 440i performance module, 330e tuning module, 320i or 330i stage 1 style tune, or B48 piggyback alternative to a flash? This JB4 unit is the most feature-rich option available.

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Headline benefits

• Up to 80 wheel horsepower on B58 and up to 40 wheel horsepower on B48 depending on fuel and conditions.
• Stronger acceleration, improved 0 to 60 and quarter-mile potential.
• Preloaded BMW-specific calibrations with on-the-fly map switching.
• More functionality and safety protections than traditional performance chips.
• Quick install and removal. No coding required.
• OEM-like smoothness across all driving modes.
• Fuel economy unchanged during gentle driving.
• Smartphone app compatible for logging and adjustments.
• 91 octane or better recommended for performance maps. Ethanol blend compatible maps available.
• Read and clear engine fault codes directly.
• Not VIN locked. Removable and resellable.
• Made in the USA with a 5 year BMS repair warranty.

We highly recommend adding the Bluetooth Connect Kit or BMS Data Cable to access logging, map selection and free firmware updates. The JB4 Mobile app is required for smartphone use.

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Map guide v13+

• Map 0: Stock. Disables module for baseline driving or diagnostics.
• Map 1: Additive, peak of 3 psi over stock. 91 octane.
• Map 2: Additive, peak of 4 psi over stock. 91 to 93 octane.
• Map 3: Additive, peak of 6 psi over stock. 93+ octane.
• Map 4: Additive, peak of 6.5 psi over stock. 93+ octane.
• Map 5: Additive, peak of 6 psi with more assertive timing for higher octane and bolt-ons.
• Map 6: Custom user map allowing additive targets below 10 psi and absolute targets above 10 psi.
• Map 7: WMI map. Boost varies with WMI additive and settings.
• Map 8: Valet or reduced boost mode.

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What you receive

• F chassis B46 B48 B58 JB4 control unit
• Extended OBDII cable for RHD cars, also fits LHD
• EWG connector
• Billet aluminium case

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Vehicle compatibility

BMW 1 Series

• 2021+ F40 B48 128ti
• 2019+ F40 B48 M135ix
• 2019+ F40 B38 118i
• 2015+ F20 F21 B58 M140i
• 2016+ F20 F21 B48 120i, 125i
• 2015+ F20 F21 B38 116i, 118i

BMW 2 Series

• 2022+ G42 B58 M240i xDrive
• 2022+ G42 B48 220i, 230i
• 2017+ F22 F23 B58 M240i iX
• 2017+ F22 F23 B48 230i iX, 225i iX, 220i iX
• 2015+ F22 F23 B38 218i
• 2015+ F45 F46 B38 216i Active Tourer and GT
• 2014+ F45 F46 B38 218i, 220i Active Tourer and GT
• 2019+ F44 M235i iX

BMW 3 Series

• 2020+ G20 G21 B58 M340i M340iX
• 2019+ G20 G21 B46 B48 318i 320i 320Li 320e 330i 330iX 330e 320Li
• 2016 to 2019 F30 F31 F34 B58 340i 340iX
• 2016 to 2018 F30 F31 F34 B48 330i 330iX 330e
• 2016 to 2018 F30 F31 B48 325i 325iX
• 2016 to 2018 F30 F31 B46 320i 320iX
• 2016 to 2018 F30 F31 B46 318i 318iX

BMW 4 Series

• 2021+ G22 G23 G26 B58 440i 440iX Gran Coupe
• 2021+ G22 G23 G26 B48 420i 430i 430iX Gran Coupe
• 2016 to 2020 F32 F33 F36 B58 440i 440iX Gran Coupe
• 2016 to 2020 F32 F33 F36 B48 430i 430iX Gran Coupe
• 2016 to 2020 F32 F33 F36 B48 425i 425iX
• 2016 to 2020 F32 F33 F36 B46 420i 420iX
• 2016 to 2020 F32 F33 F36 B38 418i

BMW 5 Series

• 2017+ G30 B58 540i 540iX
• 2017+ G30 B46 B48 530i 530iX 530e
• 2017+ G31 B58 540i 540iX

BMW 6 Series

• 2018+ G32 G33 B48 B58 630i 640i 640iX

BMW 7 Series

• 2016+ G11 G12 730i 730iX
• 2016+ G11 G12 B58 740i 740iX

BMW 8 Series

• 2019+ G14 G15 G16 B58 840i 840iX Gran Coupe

BMW X Series

• 2016+ B46 B48 X1
• 2018+ B46 B48 X2
• 2018+ G01 B48 B58 X3 2.0i 3.0i M40i including xDrive and sDrive
• 2019+ G02 B48 B58 X4 2.0i 3.0i M40i including xDrive and sDrive
• 2019+ G05 B58 X5 40i 40iX
• 2021+ G05 X5 45e
• 2019+ G06 X6 40iX
• 2019+ G07 B58 X7 40i

BMW Z4

• 2019+ G29 B58 Z4 M40i
• 2019+ G29 B46 B48 Z4 30i and 20i

Works on most BMW models fitted with B48 and B58 engines even if not explicitly listed. Unsure about your car? Contact us and we will happily check for you.

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Performance and compliance

• JB4_B58 is CARB approved under Executive Order D-744-4 for 2016 to 2018 BMW 230i, 330i, 430i, 530i, 340i, 440i, 740i, M240i and X1 applications.
• Use high quality fuel. Performance maps require 91 octane or better. Ethanol blend maps available where applicable.

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Installation and support

Quick install using the model-specific harness with no coding. For professional fitting, book with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a fitting quote and availability.

Add the JB4 Mobile Bluetooth Connect Kit to pair with iOS or Android, or connect via the BMS Data Cable to a Windows laptop. Both options enable data logging, map changes and free firmware updates as new features are released. JB4 Mobile app purchase required for smartphone use.

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Compatibility check

We will confirm fitment prior to dispatch. Provide your UK registration number or the last 7 digits of your VIN at checkout and our team will run a compatibility check.

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Photos and videos

JB4 Tuned M140i

How to install LHD

JB4 B48 B58 CANFlap Exhaust Flapper Test

JB4 F Series OBDII CANbus Wheel Control Demo

JB4 Bluetooth Phone Logging Demo

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More information

Manufacturer: Burger Motorsports

Warranty: 5 year BMS repair warranty

Part Number: F-B46B48B58-JB4

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Buy with confidence from MJ Modifications

We are BMW tuning specialists and long-time users of the JB4 system. Customers consistently report stronger mid-range torque, quicker real-world acceleration and effortless overtakes on M140i, M240i, 340i, 440i, 220i, 230i, 320i, 330i, 330e and more. Order today to transform your BMW with a safe, configurable and app-controlled performance upgrade.