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 BMW, 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 BMW tune, including user-adjustable 1st and 2nd gear boost limiting, electronic wastegate control, smartphone integration, 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 visithttps://www.jb4tech.com/forum/model-specific-engine-tuning-modification-discussion/m/27316-

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. A separate JB4 Mobile app purchase is also required.

S58 JB4 Vehicle Fitment

BMW X3M
2020+ S58 F97 BMW X3M
2020+S58F97BMWX3M Competition

BMW X4M
2020+ S58F98BMW X4M
2020+ S58F98BMW X4M Competition