Description
S63TU BMW JB4 Tuner – Plug & Play Performance for M5, M6, X5M, and X6M
Take your S63TU-powered BMW to the next level with the JB4 Tuner, the most flexible and powerful tuning solution for your M5, M6, X5M, or X6M. On stock vehicles, expect power gains of around 100whp, while cars equipped with higher octane fuel or water/methanol injection can achieve up to 240whp. With support for larger S63TU turbos, some customers have even reported 900whp to the wheels with Stage 1 turbos.
The JB4 installs via plug & play with no ECU flash required and is compatible with locked ? ECUs. Installation is fully reversible, connecting to the TMAP sensors and OBDII port, with optional BCM wiring for direct wastegate control, enabling precise boost tuning for higher performance maps. The system works seamlessly with cars already running flash maps, adding extra power, WMI control, and advanced tuning features.
JB4 Features & Benefits
- Power gains of up to 100whp on stock fuel, up to 240whp with high-octane/WMI setups
- Dramatically improves 0-60 mph acceleration and quarter-mile times
- Multiple tuning maps for different fuel types including E85 ethanol blends
- Plug & play installation with fully reversible setup
- Boost-by-gear control for optimized traction
- Integrated CANbus data logging
- Reads and deletes fault codes; logs up to 40 engine parameters
- Exhaust flap control on supported vehicles
- Integrated water/methanol injection support with progressive safety systems
- Compatible with the JB4PRO smartphone app for wireless tuning, logging, and firmware updates
- Safe, smooth, and reliable – runs as smoothly as stock
- No impact on fuel economy during normal driving
- Not VIN-locked and fully removable
- Includes billet aluminum enclosure
- Designed and assembled in the USA
- 5-year warranty
Vehicle Fitment
BMW M5:
- 2012–2017 F10 M5
BMW M6:
- 2012–2017 F12/F13 M6
BMW X5M/X6M:
- 2015–2019 F85/F86 X5M/X6M
About the JB4
The JB4 is a true plug & play performance tuner for turbocharged vehicles. Installed between the car’s sensors and DME/ECU, it manipulates boost, fuel, and timing, delivering significant horsepower and torque gains safely without flashing or unlocking the ECU. With advanced CANbus integration, Bluetooth connectivity, and ongoing firmware updates, the JB4 remains the gold standard in BMW S63TU tuning, offering flexibility, reliability, and industry-leading performance.
