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.

• Gains are 80whp/100wtq on pump gas and up to 150whp/175wtq on higher octane or E85 mixtures.
  
• Improves 0-60 times and 1/4 mile times
  
• Preloaded with custom JB4 tuning software and up to 8 maps for various fuel and modification levels
  
• Ethanol (E85) compatible tuning maps
  
• Able to read/delete fault codes
  
• View and record up to 40 different gauges/engine parameters in real-time with the JB4 app.
  
• Boost by gear in 1st, 2nd, and 3rd can be controlled via the JB4 app for a perfect launch
  
• Compatible with JB4 Mobile for smartphone logging, tuning changes, and adjustment
  
• The JB4 offers a lot more performance, functionality, and safety than your average performance chip
  
• Quick Plug & Play Installation
  
• CANbus OBDII integration offering unrivaled tuning features and performance
  
• Improved performance over non-integrated chip tunes
  
• Runs as smoothly as stock, this is how your vehicle should have come from the factory
  
• Compatible with all driving modes
  
• Fuel economy unchanged during normal driving
  
• 91 octane fuel or better required for performance gains
  
• Not VIN locked and can be removed without a trace and resold down the road
  
• Includes the rugged JB4 billet aluminum enclosure for protection
  
• Made in the USA
  
• Free USA Shipping
  
• 5 year warranty

• BMW X3 Series F97 X3 M S58 (2019+)
• BMW X3 Series F97 X3 M Competition S58 (2019+)
  
• BMW X4 Series F98 X4 M S58 (2019+)
• BMW X4 Series F98 X4 M Competition S58 (2019+)

To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number or the last 7 digits of your VIN. Simply enter your car details prior to checkout. 

Gains are 80whp/100wtq on pump gas and up to 150whp/175tq on higher octane or E85 mixtures!

You may also wish to add the Data Cable or the Bluetooth Connect Kit for additional features.

Performance Graphs

BMS189

What is a JB4?

The JB4 is a plug & play tune available for turbocharged vehicles. The JB4 tuner installs between your car's sensors and its DME/ECU (computer) and manipulates vehicle performance through these connections making your vehicle much faster. While it's not the only tuning system that operates this way the JB4 separates itself from the competition with much more advanced connection points and processing including CANbus, fuel & spark control, Bluetooth to your smartphone, and a variety of innovative and advanced features not possible with any other system. BMS regularly publishes free mapping and firmware updates adding performance and features as ongoing development allows. In addition, the JB4 system is not VIN-locked to your vehicle and can quickly be removed and swapped between cars or resold at a later time. Often imitated but never duplicated the JB4 has been the gold standard in plug and play turbocharged performance tuning for over a decade.

Manufactured by

Burger Motorsports

Warranty

5 Year BMS Repair Warranty