S58 JB4 Tuner for 2021+ BMW G80 M3, G82 G83 M4, & 2023+ G87 M2

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.
S58 JB4 Vehicle Fitment
BMW M2
• 2023+ S58 G87 BMW M2
BMW M3
• 2021-2026 S58 G80 BMW M3
• 2021-2026 S58 G80 BMW M3 Competition
BMW M4
• 2021+ S58 G82 BMW M4
• 2021+ S58 G82 BMW M4 Competition
• 2023+ S58 G82 BMW M4 CSL
• 2022+ S58 G83 BMW M4 Convertible
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 and manipulates vehicle performance through these connections making your vehicle much faster. The JB4 separates itself from the competition with more advanced connection points and processing, including CANbus, fuel & spark control, Bluetooth connectivity, and a variety of innovative and advanced features. The system is not VIN-locked and can quickly be removed, swapped between cars, or resold later.
Is the JB4 a real tune?
Yes. By tapping into specific sensors and CANbus for real-time vehicle data the JB4 can alter boost, timing, AFR, and fuel trims similar to an ECU reflash, while retaining factory safety systems and without unlocking or flagging the ECU.