Description
Unlock the full potential of your AMG with the JB4 Performance Tuner, delivering up to 100 wheel horsepower and 100 lb-ft of torque on stock vehicles. Designed for Mercedes-Benz C63, C63S, E63, E63S, AMG GT, GLC 63, and other S models, the JB4 provides smooth, factory-like power gains while retaining complete drivability and safety. Installation is plug-and-play and fully reversible, with most setups completed in under an hour.
Advanced Performance Features & CANbus Integration
The JB4 leverages CANbus technology to monitor critical engine data in real-time, allowing sophisticated tuning strategies that enhance performance safely. Safety features include:
- Limiting boost until engine oil and coolant reach optimal temperature
- Dropping to low-boost maps if overheating, knock, lean conditions, or over-boost are detected
- Full fuel control, including ethanol (E85) mapping
Preloaded with multiple performance maps—including pump fuels, E85, race fuels, WMI support, and a VALET map—the JB4 ensures optimal performance under a variety of driving and track conditions. Boost-by-gear control improves traction off the line, and exhaust flap operation is fully adjustable on supported vehicles.
Wireless JB4PRO Smartphone Connectivity
The included JB4PRO Bluetooth adapter allows connection to iOS or Android devices, providing:
- Real-time performance monitoring and data logging
- On-the-fly switching between performance maps
- Firmware updates with new maps and features
- Advanced diagnostic tools and performance estimations
The adapter fits entirely within the JB4 billet aluminum enclosure for superior weather protection and a streamlined appearance.
Key Features & Benefits
- Up to +100 wheel HP and +100 lb-ft torque gains
- Improves 0-60 times and quarter-mile performance
- Multiple maps for pump fuel, E85, race fuel, WMI, and VALET mode
- Plug-and-play installation, fully removable
- Reads and deletes fault codes
- Logs up to 40 engine parameters in real time
- Boost-by-gear control for optimized traction
- Exhaust flap operation adjustment on supported vehicles
- Full CANbus integration for advanced tuning and safety
- Smooth, stock-like drivability
- Compatible with all driving modes, no impact on fuel economy
- Not VIN locked; portable between vehicles
- Durable billet aluminum enclosure
- Designed and assembled in the USA
- 5-year warranty
Optional Boost Control Module (BCM)
For vehicles pursuing very high boost levels, WMI, larger turbos, or high-octane fuels, the optional BCM allows adjustment of wastegate duty cycle for enhanced boost control.
Vehicle Fitment
C-Class
- 2015+ Mercedes-Benz C63 & C63S AMG
E-Class
- 2017+ Mercedes-Benz E63 & E63S AMG
GT
- 2015+ Mercedes-Benz AMG GT, GT S, & GT R
GLC
- 2015+ Mercedes-Benz GLC 63 & 63S AMG
AMG GT
- 2018–2021 Mercedes-Benz AMG GT 63 & 63S
Why Choose JB4?
The JB4 is a proven, plug-and-play tuning solution that provides ECU-level performance gains without unlocking, flagging, or permanently modifying your ECU. With ongoing firmware updates, smartphone connectivity, and advanced CANbus integration, the JB4 ensures your Mercedes-Benz AMG performs at its absolute peak while maintaining factory safety standards.
