Description
JB4 Performance Tuner for BMW S63 F9x M5, M8, X5M, & X6M
Elevate your BMW S63 F9x M5, M8, X5M, or X6M to new performance heights with the JB4 Performance Tuner. Designed for plug & play installation, the JB4 provides up to 80 wheel horsepower (WHP) on pump gas and up to 150 WHP on race fuel on a stock vehicle—all without flashing your ECU or compromising reliability.
The JB4 harnesses the full potential of the all-wheel-drive F9x ///M platform, delivering up to 80 WHP and 100 WTQ, transforming acceleration and enabling 1/4 mile potential deep into the 10-second range. Unlike generic tuning solutions, the JB4 features full CANbus integration via the OBDII port, electronic wastegate (EWG) control for precise boost targeting, and advanced safety and diagnostic features.
Installation is fully reversible using the TMAP sensors and OBDII port. Optional EWG wiring allows direct wastegate control for higher boost maps. No ECU flash is required, and the JB4 is compatible with locked ? ECUs. Firmware updates are easily loaded through the JB4PRO app or BMS Data Cable, ensuring access to future performance maps and features.
JB4 Features & Benefits
- Power gains up to 80hp and 100tq on a stock S63TU engine
- Enhances 0-60 mph acceleration and quarter-mile times
- Multiple performance maps for different fuel types
- Plug & play installation, fully reversible
- 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
- Fully compatible with the JB4PRO smartphone app for wireless logging, map selection, and firmware updates
- Full CANbus integration for real-time tuning
- Runs as smoothly as stock in all driving modes
- No impact on normal fuel economy
- Requires 91 octane or better for maximum performance
- Not VIN locked; fully removable and transferable
- Includes billet aluminum enclosure
- Designed and assembled in the USA with a 5-year warranty
Vehicle Fitment
M5
- 2018–2024 BMW F90 M5, M5 Competition, M5 CS
M8
- 2020–2023 BMW F92 M8 Coupe and M8 Competition
- 2020–2023 BMW F93 M8 Gran Coupe
- 2020–2023 BMW F91 M8 Convertible
X Series
- 2020–2023 BMW F95 X5M and X5M Competition
- 2020–2023 BMW F96 X6M and X6M Competition
JB4 Overview
The JB4 is a plug & play performance tuner for turbocharged vehicles. It installs between your car’s sensors and DME/ECU to manipulate boost, timing, and fueling for safe, reliable, and significant performance gains. Advanced CANbus integration, fuel & spark control, and Bluetooth smartphone connectivity set the JB4 apart from standard tuning devices. Fully removable and not VIN-locked, it works with stock or aftermarket flash maps and is supported by ongoing free firmware updates. The JB4 has been the gold standard in turbocharged plug & play tuning for over a decade and is sold in over 67 countries worldwide.
Is the JB4 a Real Tune?
Yes. By utilizing sensor and CANbus data in real time, the JB4 adjusts boost, timing, air/fuel ratio, and fuel trims—matching the effect of a traditional ECU reflash without your vehicle ever knowing it’s tuned. The result is smooth, safe, and powerful performance gains while retaining all factory safety features.
