Description
Unlock the full performance potential of your Mercedes-Benz AMG 35 platform with the JB4 Performance Tuner, the most advanced plug-and-play tuning solution available. Delivering 30–60 wheel horsepower gains on pump gas, with even greater performance on higher octane fuels or E85 blends, the JB4 transforms your driving experience with increased power, torque, and responsiveness.
Plug-and-Play Installation with No ECU Flashing
The JB4 installs quickly using factory connections located on top of the engine, making installation and removal fast and completely reversible. By safely increasing turbocharger boost levels by 3–6 PSI, while recalibrating timing and fueling, the JB4 provides substantial performance gains without modifying or unlocking your ECU.
Compatible with both all-wheel drive (4MATIC) and front-wheel drive configurations, the JB4 maintains factory drivability, reliability, and safety systems.
Advanced CANbus & Wastegate Integration
Unlike basic tuning devices, the JB4 features full CANbus integration and optional wastegate control, enabling it to access and process real-time engine data for precision tuning and enhanced safety. This results in smoother power delivery, improved throttle response, and superior performance compared to standard piggyback systems.
Wireless JB4PRO Smartphone Connectivity
Included with your JB4 is the JB4PRO Bluetooth adapter, allowing seamless wireless control via iOS and Android devices. With the free JB4PRO app, you can:
- Switch performance maps on demand
- Monitor and log real-time engine data
- Read and clear fault codes
- Update firmware with new features and performance enhancements
The adapter is fully integrated داخل the JB4 enclosure for enhanced durability and a clean, factory-style appearance.
JB4 Features & Benefits
- 30–60 WHP gains on pump gas, higher with E85 or race fuel
- Improved 0-60 mph and quarter-mile acceleration
- Multiple tuning maps for different fuels and performance levels
- Quick plug-and-play installation with no ECU flash required
- Supports E85 ethanol blends
- Reads and deletes diagnostic fault codes
- Logs up to 40 engine parameters in real time
- Boost-by-gear control for improved traction
- Exhaust flap control on supported vehicles
- Full CANbus integration for advanced tuning and safety
- Smooth, OEM-like drivability
- Compatible with all factory driving modes
- No impact on fuel economy during normal driving
- Requires 91 octane or higher for optimal performance
- Not VIN locked and fully removable
- Durable billet aluminum enclosure
- Designed and assembled in the USA
- 5-year warranty
Vehicle Fitment
Mercedes-Benz:
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 a plug-and-play performance tuner designed for turbocharged vehicles. It connects between your vehicle’s sensors and ECU, allowing it to safely modify boost, ignition timing, and fueling in real time. With advanced CANbus integration, smartphone connectivity, and continuous firmware updates, the JB4 delivers significant power gains without permanent ECU modification.
Is the JB4 a real tune?
Yes. The JB4 actively adjusts engine parameters using real-time data, delivering safe, smooth, and substantial horsepower and torque gains comparable to ECU flash tuning—without unlocking or flagging your ECU.
