Description
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JB4 Tuner for 2023+ Mercedes-Benz C43 / GLC / C63S AMG 2.0L Hybrid
Unlock maximum performance for your 2.0L turbo hybrid Mercedes-Benz with the JB4 Tuner, now featuring the JB4PRO adapter and free mobile app. Designed for the C43 AMG, GLC 63 AMG, and C63S E Performance AMG, this plug-and-play tuner installs quickly on two accessible plugs atop the engine. Safely increasing turbocharger output by 3–6 psi, the JB4 delivers significant gains in horsepower and torque while ensuring timing and fueling are fully optimized for performance and reliability. Installation is completely reversible, making it ideal for enthusiasts who want a powerful yet non-permanent upgrade.
The JB4 stands apart from traditional 2-channel tuning systems with full CANbus integration, providing smoother operation, improved drivability, and advanced vehicle data control.
Smartphone Integration & JB4PRO App
Wirelessly connect your JB4 tuner to any Bluetooth 4.0-compatible iOS or Android device using the included JB4PRO adapter. The free app allows you to:
- Record and analyze vehicle performance and tuning data
- Switch between multiple performance maps for different fuels
- Update JB4 firmware with free future releases, adding new maps and features
- Access advanced log analysis tools to estimate performance and monitor engine health
The adapter fits fully within the JB4 enclosure for enhanced weather protection and a sleek, streamlined look. The JB4PRO app features an intuitive interface, help buttons, and detailed analysis tools for both novice and advanced tuners.
Features & Benefits
- Power gains up to 50whp for the C43 and 100whp for the C63 on pump gas
- Improved 0-60 mph acceleration and quarter-mile performance
- Multiple performance maps for different fuel types including E85
- Quick plug-and-play installation, no ECU flash required
- Read and clear fault codes, log up to 40 engine parameters
- Boost-by-gear control for enhanced traction
- Exhaust flap control on supported vehicles
- Full CANbus integration for smooth operation and advanced diagnostics
- Compatible with the free JB4PRO mobile app
- Runs as smoothly as stock in all driving modes
- No impact on fuel economy during normal driving
- Requires 91 octane or higher for maximum gains
- Non-VIN locked and fully removable
- Durable billet aluminum enclosure
- Designed and assembled in the USA
- 5-year warranty
Vehicle Fitment
Mercedes-Benz C43 AMG (M139) – 2023+ 2.0L Turbo Mild Hybrid
Mercedes-Benz GLC 63 AMG (M139) – 2023+ 2.0L Turbo Plug-In Hybrid
Mercedes-Benz C63S E Performance AMG (M139) – 2024+ 2.0L Turbo Plug-In Hybrid
Why Choose JB4?
The JB4 is a true plug-and-play performance tuner that manipulates critical sensors and CANbus signals to optimize boost, spark, and fuel control without altering the ECU. Unlike basic chip or 2-channel tuners, the JB4 provides:
- Real-time diagnostics
- Smartphone connectivity for logging and map changes
- Free firmware and mapping updates
- Non-permanent installation that can be removed or transferred between vehicles
With over a decade of refinement and trusted in 67+ countries, the JB4 remains the gold standard for turbocharged vehicle tuning, offering safe, smooth, and significant power gains while retaining all factory safety systems.
