Description
The Burger Tuning JB4 for the 2020+ Mercedes-Benz AMG 35 Series delivers +30–60whp on pump gas and even more with high-octane or E85 blends.
This plug-and-play performance tuner connects to easily accessible engine sensors, raising turbo boost by 3–6psi while recalibrating fueling and timing for smooth, factory-like drivability. The JB4’s CANbus integration enables real-time tuning adjustments using throttle input, AFR, ignition timing, knock control, and more — a major advantage over simpler two-channel piggyback systems.
With 8 preloaded maps for different fuels and performance needs, you can switch between stock, valet, and high-performance tunes on the fly using the optional JB4 Mobile App or BMS Data Cable.
Installation takes minutes, is fully reversible, and leaves no ECU flash footprint. Perfect for daily drivers who want more power without compromising reliability.
Features & Benefits
- Gains of +30–60whp on pump gas, higher with E85/race fuel
- 8 maps for pump gas, E85 blends, stock, and valet mode
- Ethanol (E85) compatible tuning maps
- Boost-by-gear for optimal traction in 1st–3rd gears
- View & log up to 40 engine parameters in real time with JB4 app
- Read & clear diagnostic fault codes
- Quick plug-and-play installation — no cutting or splicing
- Fully CANbus integrated for advanced safety and tuning
- Maintains factory-like smoothness and drivability
- Compatible with all drive modes
- Not VIN-locked — transferable to another vehicle
- Rugged billet aluminum enclosure
- Made in USA — 5-year warranty
Vehicle Fitment
A-Class
-
2020+ Mercedes-Benz A35 AMG
CLA-Class
-
2020+ Mercedes-Benz CLA 35 AMG
GLA-Class
-
2020+ Mercedes-Benz GLA 35 AMG
GLB-Class
- 2020+ Mercedes-Benz GLB 35 AMG
- 2020+ Mercedes-Benz GLB 250 2.0T
What is a JB4?
The JB4 is the industry-leading piggyback ECU tuner for turbocharged vehicles. It installs between your factory ECU and engine sensors, optimizing boost, timing, and fueling without permanently altering the ECU software.
With CANbus integration, the JB4 reads live data from dozens of parameters — including AFR, ignition advance, fuel trims, throttle input, and knock control — to deliver precise power increases while protecting engine health.
Burger Motorsports regularly provides free firmware updates with new maps and features, keeping your JB4 at the cutting edge of performance tuning.
