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

The ultimate tune for your S58 powered G80 M3 and G82 G83 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 makingthe JB4 an excellentchoicefor yourS58 engine.

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 differentgauges/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 yourvehicleshould 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 M2
2023+ S58 G87 BMW M2

BMWM3
2021+ S58 G80 BMW M3
2021+ S58 G80 BMW M3 Competition

BMWM4
2021+ S58 G82 BMW M4
2021+ S58 G82 BMW M4 Competition

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.If your looking forS58 tuning for your 2021+ G80 M3 or G82 G83 M4 the JB4 is a perfect S58engine tune.