Burger Motorsports JB4 PRO Tuning Controller (BMW S58 G8x M2 / M3 / M4)

The Burger Motorsports JB4 PRO is an advanced piggyback engine control unit designed for the BMW S58 engine, allowing intelligent real-time tuning without modifying the factory ECU software. The unit connects between the engine harness and ECU, intercepting and optimizing commands to safely increase power and enhance engine behavior in G8x M-series models.

JB4 PRO – New Metal-Cased Version

The new JB4 PRO comes in a durable metal enclosure and includes JB4 PRO Bluetooth connectivity as standard, along with additional functionality such as fuel pressure control. Compared to the standard JB4, the PRO version offers more precise adjustment and expanded tuning capability.

The system includes multiple pre-configured maps for different fuel types, blends, and modification levels (based on petrol, ethanol blends, or WMI). You can also load full custom maps or use third-party tuner maps available online. Through the Bluetooth mobile app, you can monitor live engine data, switch maps on the fly, and perform your own tuning adjustments. The JB4 can be removed without leaving any trace, making it an excellent choice for vehicles still under factory warranty.

Plug & Play – Works With Locked ECUs

According to the manufacturer, power gains can exceed +100 hp depending on fuel quality and supporting modifications. JB4 also supports FlexFuel/E85 setups and optional WMI systems. Installation is fully plug & play using the factory connectors, without opening or modifying the stock DME software.

Features

• Piggyback ECU – no modification to the factory ECU file
• Durable metal enclosure (JB4 PRO)
• Supports fuel pressure control
• Pre-configured maps for multiple fuel types and setups
• Bluetooth connectivity for map switching and live data
• Supports custom tuning and datalogging
• Compatible with FlexFuel/E85 setups (with accessories)
• Fully removable without trace
• Not TÜV approved – motorsport/off-road part

Read more at the manufacturer’s website: Burger Motorsports – S58 JB4

Download installation guide: JB4 Installation Instructions (PDF)

Vehicle Compatibility

BMW M2
G87 M2 (S58)

BMW M3
G80 M3 / M3 Competition
G81 M3 Touring

BMW M4
G82 M4 / M4 Competition
G83 M4 Convertible / Competition

Note: Fits S58 engines only. Not compatible with B58 GEN3 models.