S58 JB4 BETA for 2020+ BMW X3M/X4M

  • $ 799.00
Shipping calculated at checkout.

SKU: JB4_S58

Gains are 60whp/80wtq on pump gas and up to 100whp/120wtq on higher octane or E85 mixtures.

The ultimate tune for your S58 powered vehicle, the JB4 allows you to go from factory stock to full race, and everywhere in between, with the push of a button on your steering wheel. The JB4 installs and removes easily and includes many unique features not found in any other tune including user adjustable 1st and 2nd gear boost limiting, map switching in dash, electronic wastegate control, ethanol fuel support, and built in advanced CANbus based diagnostic tools. Installation is completely removable with no splicing or cutting of factory wires.

For the latest performance results, updates, firmware, and map guide be sure to visit N54tech.com.

Wirelessly connect the JB4 to your Bluetooth 4.0 compatible iOS and Android device via the JB4 Mobile connect kit, or to your Windows laptop with the BMS data cable. Both options allow you to record and analyze vehicle and tuning data, change JB4 performance maps, and update JB4 firmware as we release free newer versions with updates, more powerful maps, and new features under development. Separate JB4 Mobile app purchase also required.


JB4 Tuner for S55 BMW M3 M4 M2 competition


• Gains are 60whp/80wtq on pump gas and up to 100whp/100wtq on higher octane or E85 mixtures.
• Quick Plug & Play Installation
• CANbus integration offering unrivaled tuning features and performance 
• Runs as smoothly as stock, this is how your BMW should have come from the factory 
• Compatible with all driving modes 
• Fuel economy unchanged during normal driving
• Compatible with JB4 Mobile for smartphone logging, tuning changes, and adjustment 
• Ethanol (E85) compatible tuning maps
• Able to read/delete fault codes 
• Not VIN locked, can be removed without a trace and resold down the road 
• Made in the USA 
• Free USA Shipping
• 5 year warranty

S58 JB4 Applications

• 2020+ S58 X3M
2020+ S58 X3M Competition

• 2020+ S58 X4M
2020+ S58 X4M Competition

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