Description
The Burger Tuning JB4 is the most advanced plug & play performance tuner for all GEN1 & GEN2 BMW B58 engines, delivering up to 120whp and 120wtq on pump gas with no ECU flash required—even on locked ECUs. Gains are even higher with bolt-ons, high-octane fuel, E85 blends, or upgraded turbos.
With full CANbus integration, the JB4 allows in-dash or app-based map switching, boost-by-gear control, ethanol-compatible tuning maps, exhaust flap control, progressive WMI support, fault code reading/clearing, and detailed data logging. Installation is fully reversible and requires no cutting or splicing, making it warranty-friendly.
Whether you want a subtle street boost or race-level performance, the JB4 has 8 preloaded maps and supports custom tuning. The system runs as smoothly as stock during normal driving but transforms your BMW into a much faster, more responsive machine under load.
JB4 Features & Benefits
- Power Gains: Up to 120whp / 120wtq on pump gas (higher with mods, E85, or octane boost)
- 8 preloaded maps: Stock, mild, aggressive, ethanol, WMI, and valet modes
- Boost-by-gear control for better traction in lower gears
- E85-compatible tuning maps included
- Exhaust flap operation control on most applications
- Fault code reading and clearing via JB4 app
- View and log up to 40 engine parameters in real time
- CANbus OBDII integration for superior tuning precision and safety features
- Optional direct EWG control to prevent throttle closure with aftermarket exhausts
- Progressive water/methanol injection support
- Works with all driving modes; no fuel economy loss during normal driving
- Plug & Play install—no ECU flash required
- Not VIN-locked; easily transferable or removable without trace
- Rugged billet aluminum JB4 enclosure for protection
- Designed and assembled in the USA
- 5-year warranty
Vehicle Fitment (GEN1 & GEN2 B58)
BMW 1 Series
-
2016–2019 F20/F21 M140i
BMW 2 Series
- 2022+ G42 M240i (incl. xDrive)
- 2016–2021 F22/F23 M240i (incl. xDrive)
BMW 3 Series
- 2020–2024 G20/G21 M340i (incl. xDrive)
- 2016–2018 F30 340i (incl. xDrive)
BMW 4 Series
- 2021–2024 G22/G23/G26 M440i (incl. GC & xDrive)
- 2016–2020 F32/F33/F36 440i (incl. GC & xDrive)
BMW 5 Series
-
2017–2023 G30/G31 540i (incl. xDrive)
BMW 6 Series
-
2018–2023 G32/G33 640i (incl. xDrive)
BMW 7 Series
-
2016–2022 G11/G12 740i (incl. xDrive)
BMW 8 Series
-
2018+ G15/G14/G16 840i (incl. GC & xDrive)
BMW X Series
- 2018–2024 G01 X3 M40i / 3.0i (incl. xDrive)
- 2019–2024 G02 X4 M40i / 3.0i (incl. xDrive)
- 2019–2022 G05 X5 40i (incl. xDrive)
- 2020–2023 G06 X6 40i xDrive
- 2019–2022 G07 X7 40i (incl. xDrive)
BMW Z4
-
2019+ G29 Z4 M40i
What is a JB4?
The JB4 is a plug & play tuning solution for turbocharged BMWs that connects between your sensors and ECU to optimize boost, fuel, and timing for maximum performance. With CANbus integration, ethanol support, advanced safety features, and ongoing free firmware updates, the JB4 offers unmatched flexibility and value. It’s fully reversible, not VIN-locked, and has been the gold standard in piggyback tuning for over a decade.
