Description
The Burger Tuning JB4 Tuner for the BMW S58-powered F97 X3M and F98 X4M delivers massive performance gains without touching the factory ECU file. Expect +80whp/+100wtq on pump gas and up to +150whp/+175wtq with E85 or race fuel blends.
Designed for factory stock or fully modified builds, the JB4 integrates with the S58’s CANbus system for unmatched tuning precision and safety. Features include user-adjustable boost-by-gear, electronic wastegate control, ethanol-compatible mapping, real-time logging, fault code reading, and full smartphone integration.
Installation is quick and 100% reversible — perfect for leased vehicles or owners who want big power without a flash footprint.
Features & Benefits
- Gains of +80whp/+100wtq on pump gas, up to +150whp/+175wtq on E85/race gas
- Preloaded with 8 performance maps for various fuels and modifications
- Ethanol (E85) compatible maps included
- Boost-by-gear control for better traction in lower gears
- View and record up to 40 engine parameters in real time with the JB4 app
- Built-in diagnostic tools — read and clear fault codes
- Works with all factory drive modes
- Maintains smooth OEM-like drivability and fuel economy during normal driving
- Quick plug-and-play installation, no cutting or splicing
- Not VIN-locked — transferable to another compatible vehicle
- Rugged billet aluminum enclosure for durability
- Made in the USA, backed by a 5-year warranty
Vehicle Fitment
BMW X3M (F97)
- 2020+ BMW X3M (S58)
- 2020+ BMW X3M Competition (S58)
BMW X4M (F98)
- 2020+ BMW X4M (S58)
- 2020+ BMW X4M Competition (S58)
What is a JB4?
The JB4 is the industry’s most advanced plug-and-play ECU tuning system for turbocharged vehicles. It installs between your factory sensors and ECU, intercepting and optimizing performance parameters like boost, ignition timing, and fuel delivery.
Unlike basic boost controllers, the JB4 integrates via CANbus to access and adjust dozens of factory data channels, allowing for precise mapping, ethanol fuel support, and advanced safety protocols. Burger Motorsports provides free firmware updates and tuning refinements, ensuring your JB4 evolves alongside your build.
The unit is 100% removable, not VIN-locked, and can be resold or moved between compatible cars.
