The ultimate tune for your S58-powered G80 M3 and G82 M4, the JB4 allows you to go from factory stock to full race and everywhere in between. 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, smartphone integration, electronic wastegate control, ethanol fuel support, and built-in advanced CANbus-based diagnostic tools. Installation is easy and completely removable with no splicing or cutting of factory wires making the JB4 an excellent choice for your S58 engine.
Wirelessly connect the S58 JB4 to your Bluetooth 4.0 compatible iOS and Android® device via the JB4 Mobile Connect Kit (See T#598298) or to your Windows® laptop with the BMS Data Cable (See T#403193). Both options allow you to record and analyze vehicle and tuning data, change JB4 performance maps, and update S58 JB4 firmware as we release free newer versions with updates, more powerful maps, and new features under development. A separate JB4 Mobile app purchase is also required.
S58 JB4 FEATURES & BENEFITS
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 S58 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 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 - JB4 Wireless Mobile Smart Phone Kit Required (See T#598298)
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
S58 JB4 Vehicle Fitment:
BMW M3
2021+ S58 G80 BMW M3
2021+ S58 G80 BMW M3 Competition
BMW M4
2021+ S58 G82 BMW M4
2021+ S58 G82 BMW M4 Competition
The ultimate tune for your S58-powered G80 M3 and G82 M4, the JB4 allows you to go from factory stock to full race and everywhere in between. 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, smartphone integration, electronic wastegate control, ethanol fuel support, and built-in advanced CANbus-based diagnostic tools. Installation is easy and completely removable with no splicing or cutting of factory wires making the JB4 an excellent choice for your S58 engine.
S58 JB4 FEATURES & BENEFITS
Power gains up to 150whp/175wtq
Improves 0-60 and quarter mile times.
Includes multiple tuning maps for different fuel types.
Quick plug and play installation.
Supports E85 ethanol blends.
Reads and deletes fault codes.
Displays and logs up to 40 engine parameters.
Boost by gear control for improved traction.
Controls exhaust flap operation on supported vehicles.
Compatible with the free JB4PRO app.
Offers better performance and safety than basic chip tunes.
Full CANbus integration.
Runs as smoothly as stock.
Compatible with all driving modes.
No impact on fuel economy during normal driving.
Requires 91 octane or better for performance gains.
Not VIN locked and fully removable.
Includes billet aluminum enclosure.
Designed and assembled in the USA.
5-year warranty.
Wirelessly Connect to your JB4: Our all-new JB4 PRO smartphone connection is included to wirelessly connect the JB4 tuner to your Bluetooth 4.0 compatible iOS or Android device. This option allows 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. Our new adapter fits fully inside the JB4 enclosure for enhanced weather protection and a more streamlined look. The JB4PRO Free app features an intuitive easy-to-use interface, help buttons, and advanced log analysis tools that can estimate the performance of your car and help identify any tuning concerns.
Not for sale or use in the state of California on any pollution-controlled vehicle as per the California Air Resources Board.
Prop 65 Warning
Previous Revisions
S58-JB4-G8X
JB4-S58-G87
Product Q&A
Lifetime Replacement
This Product Is Covered By Our Lifetime Replacement Program
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Fits These Cars
MAKE
MODEL
SUBMODEL
ENGINE
Special Fitment Notes
BMW
G80
M3
S58 3.0L
Use vehicle selector to confirm fitment
BMW
G80
M3 Competition
S58 3.0L
Use vehicle selector to confirm fitment
BMW
G80
M3 Competition xDrive
S58 3.0L
Use vehicle selector to confirm fitment
BMW
G82
M4
S58 3.0L
Use vehicle selector to confirm fitment
BMW
G82
M4 Competition
S58 3.0L
Use vehicle selector to confirm fitment
BMW
G82
M4 Competition xDrive
S58 3.0L
Use vehicle selector to confirm fitment
BMW
G83
M4 Competition xDrive
S58 3.0L
Use vehicle selector to confirm fitment
BMW
G87
M2
S58 3.0L
Use vehicle selector to confirm fitment
*The above product applications have been written by Turner Motorsport. All
warranties, product application, fitment, and performance are the responsibility of Turner Motorsport.
For additional information see the terms of use.
Prop 65 Warning
