Burger Motorsports JB4 BMW N54 Plug & Play Tuning Box | Piggyback ECU Tuner for 1M, 135i, 335i/335is, 535i, Z4 35i/35is, X6 xDrive35i | E85/WMI, CANbus, Map Switching

JB4 Power Module for BMW N54 - Instant, Safe, Reversible Performance

Looking for a serious power upgrade for your twin turbo straight six without opening the ECU or doing a remap? The BMS JB4 plug-in power module is the proven add-on controller for the BMW N54 engine. Expect harder acceleration, sharper throttle, smooth factory-like drivability and big gains with zero fuss. Ideal for road, track day and drag use, and a brilliant remap alternative for anyone who wants a clean, reversible install.

We run JB4 on our own N54 builds and our customers consistently report a night-and-day transformation in punch and response. If you want reliable horsepower and clever features in one neat unit, this is the upgrade UK N54 owners keep coming back for.

Why this JB4 makes your N54 come alive

• Massive performance uplift - commonly up to around 100 wheel horsepower and 100 lb ft on completely stock hardware depending on fuel quality and conditions
• Scales with mods - with intakes, intercooler, exhaust and ethanol blends you can unlock even larger gains on factory turbos, and support big single or hybrid turbo setups
• True plug-in install - factory style connectors, no cutting, no permanent changes, remove without trace
• CAN integration - advanced safety, enhanced data, in-dash features and smart control logic
• Multiple drive maps - switchable power levels from the cabin including stock bypass and valet
• Ethanol ready - supports E blends when used as directed for excellent knock resistance
• Progressive water meth control - built-in failsafes for WMI users
• Adaptive tuning - automatically adjusts to octane, ambient conditions and hardware
• Optional in-cluster boost display, programmable shift light and torque limiting for launches
• Optional 2STEP and no-lift shifting for manuals, optional top speed delimiter
• Reads and clears diagnostic trouble codes
• Not VIN locked - move it to another car or sell on later
• Fuel economy unchanged in normal driving

Who it fits - BMW models with the N54 twin turbo engine

1 Series

• 2008 to 2010 E82 135i Coupe
• 2008 to 2010 E88 135i Convertible
• 2011 E82 1M Coupe

3 Series

• 2006 to 2010 E90 335i and 335ix Saloon
• 2006 to 2010 E91 335i and 335ix Touring
• 2006 to 2010 E92 335i and 335ix Coupe
• 2007 to 2010 E93 335i and 335ix Convertible
• 2011 to 2013 E92 335is

5 Series

• 2008 to 2010 E60 535i and 535ix Saloon
• 2008 to 2010 E61 535i and 535ix Touring

X Series

• 2009 to 2010 E71 X6 xDrive35i

Z Series

• 2009 to 2016 E89 Z4 sDrive35i and sDrive35is

Transmission - fully compatible with manual and DCT.

Map options and safety

Selectable maps cover everything from stock bypass and valet to pump fuel performance, auto-tuning for bolt-on cars, dedicated WMI control and high octane race settings. Oil temperature protection keeps boost stock-like until warm and tapers at extreme temps. Additional safeguards can automatically revert to a safety map if boost, fuel pressure or AFR move out of range.

Optional accessories

• JB4 Data Cable - laptop connection for firmware updates, datalogging and map adjustments
• JB4 Bluetooth Connect Kit - use the JB4 Mobile app for wireless control, live gauges and logging

Real world results

From a totally standard 135i on regular fuel to fully bolted 335i and Z4 builds on ethanol blends, JB4 delivers repeatable gains you can feel. See the dyno examples below for typical improvements across different setups.

Fitting and support

Want it installed and set up by specialists? Book professional fitting with MJ Modifications in Warwickshire. Email info@mjmodifications.co.uk for a quote.

Compatibility check before dispatch

We verify fitment before shipping. Please add your UK registration or the last 7 of your VIN at checkout so we can confirm suitability.

Manufacturer and warranty

Manufacturer - Burger Motorsports

Warranty - 5 Year BMS Repair Warranty

Part number - E-N54-JB4

Search-friendly terms customers use

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Ready to feel the difference? Add the JB4 to your basket today and transform how your N54 drives.