Description
Take your 2025+ BMW M5 G90 or M5 Touring G99 to the next level with the JB4 Performance Tuner. Delivering up to 93whp on pump gas and up to 135whp on higher octane or E85 fuels, the JB4 transforms your 4.4L S68-powered M5 from stock to full race-ready performance, while retaining complete control and safety.
This plug-and-play tuning solution installs easily without splicing or cutting any factory wires, making it fully removable. It includes unique features unavailable in any other tune, including gear-specific boost limiting, electronic wastegate control, smartphone integration, ethanol fuel support, and advanced CANbus-based diagnostics. No ECU flash is required, and it’s compatible with locked ECUs.
JB4PRO Wireless App Integration
The JB4 includes the JB4PRO adapter and free mobile app, enabling seamless connection to iOS and Android devices via Bluetooth 4.0. Through the app, you can:
- Monitor engine performance and logging in real-time
- Adjust JB4 performance maps on the fly
- Update firmware with free new maps and features
- Analyze performance and identify tuning concerns
The adapter is housed entirely within the JB4 enclosure for enhanced weather protection and a clean, professional appearance.
Features & Benefits
- Gains of 93whp on pump gas, up to 135whp on higher octane or E85
- Improves 0-60 mph acceleration and quarter-mile performance
- Multiple performance maps for different fuel types
- Quick plug-and-play installation, fully reversible
- Supports E85 ethanol blends
- Read and clear fault codes; log up to 40 engine parameters
- Boost-by-gear control for improved traction
- Exhaust flap control on supported vehicles
- Full CANbus integration for advanced diagnostics and smooth operation
- Compatible with all driving modes, runs as smoothly as stock
- No impact on fuel economy during normal driving
- Requires 91 octane or higher for full performance gains
- Non-VIN locked and fully removable
- Durable billet aluminum enclosure
- Designed and assembled in the USA
- 5-year warranty
Vehicle Fitment
BMW M5:
- 2025+ S68 G90 BMW M5
- 2025+ S68 G99 BMW M5 Touring
Why Choose JB4?
The JB4 is a true plug-and-play tuner for turbocharged BMW vehicles. By interfacing with engine sensors and CANbus data, it safely optimizes boost, timing, and fuel trims without ever altering your ECU. Fully non-VIN locked, the JB4 can be removed or transferred to another vehicle, maintaining factory safety systems while providing smooth, reliable, and significant performance gains. Over a decade of proven use in 67+ countries makes JB4 the gold standard in turbocharged BMW tuning.
