S58 JB4 Tuner for 2020+ BMW F97 X3M & F98 X4M

Gains are 80whp/100wtq on pump gas and up to 150whp/175tq on higher octane or E85 mixtures. JB4PRO app included. The ultimate tune for your S58 powered F97 X3M & F98 X4M, 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.

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Wirelessly connect the JB4 to your iOS or Android device 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. The JB4PRO 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.

Optional Extension Harness: These plug and play connectors simplify the installation and removal of JB4 and other S58 piggyback systems by allowing you to bypass the difficult to reach lower MAP sensor by attaching the connections to each other. Availalble here.

Vehicle Fitment

• BMW X3M
• 2020+ S58 F97 BMW X3M
• 2020+ S58 F97 BMW X3M Competition BMW X4M
• 2020+ S58 F98 BMW X4M
• 2020+ S58 F98 BMW X4M CompetitionClick here for S58 G8x M3/M4 JB4