Description
Unlock the full potential of your Audi RS3 or TTRS with the JB4 Group 9 Tuner, delivering up to 100whp and 100wtq on stock vehicles. This plug-and-play performance solution installs easily in your engine bay, connecting to factory sensors and working with your ECU to optimize boost, timing, and fueling for maximum power and minimal turbo lag.
Built with full SENT sensor technology and CANbus integration, the JB4 accesses complete engine data to safely control performance. Its advanced safety features manage boost until oil and coolant temperatures reach optimal levels, protect against lean conditions, overboost, knock, or overheating, and provide fuel control for ethanol blends.
Wireless JB4PRO App Integration
The JB4 includes the JB4PRO wireless adapter, allowing seamless connection to any iOS or Android device with Bluetooth 4.0. The free app enables:
- Real-time engine parameter monitoring and logging
- Map selection and on-the-fly tuning adjustments
- Free firmware updates with future maps and features
- Performance analysis and diagnostic tools
The adapter fits fully inside the JB4 enclosure, offering enhanced weather protection and a clean, professional appearance.
Features & Benefits
- Power gains of up to 100whp and 100wtq on a stock vehicle
- Improves 0-60 mph acceleration and quarter-mile performance
- Multiple performance maps for different fuel types including E85 ethanol blends
- Quick plug-and-play installation, fully reversible
- Boost-by-gear control for improved traction
- Read and clear fault codes, log up to 40 engine parameters
- Exhaust flap control on supported vehicles
- Full CANbus integration for advanced diagnostics and smooth operation
- Compatible with the JB4PRO app for wireless control and logging
- Runs as smoothly as stock in all driving modes
- No impact on fuel economy during normal driving
- Requires 91 octane or higher for full performance gains
- Non-VIN locked and fully removable
- Durable billet aluminum enclosure
- Designed and assembled in the USA
- 5-year warranty
Vehicle Fitment
The JB4 Group 9 has been tested globally across all markets and year models:
Audi:
- 2017+ RS3 8V2
- 2018+ TTRS 8S
- 2022–2024 RS3 8Y
- 2025+ RS3 8Y2 Facelift
Why Choose JB4?
The JB4 is a true plug-and-play tuning solution for turbocharged Audi models. By interfacing with engine sensors and CANbus data, it safely optimizes boost, fuel, and timing without modifying the ECU. Fully non-VIN locked and removable, it retains all factory safety systems while delivering smooth, reliable, and significant power gains. With over a decade of proven performance in 67+ countries, JB4 remains the gold standard in plug-and-play tuning for turbocharged vehicles.
