Description
Alfa Romeo 2.0L JB4 Tuner – Plug-and-Play Turbo Performance Upgrade
Unlock the full potential of your 2017+ Alfa Romeo Giulia or Stelvio 2.0L 4-cylinder turbo with the JB4 Tuner, the most advanced plug-and-play tuning system available. On a completely stock vehicle, the JB4 delivers up to 40 wheel horsepower (55 crank horsepower), with even greater gains achievable on higher octane fuel, E85 blends, or with bolt-on modifications and larger turbos.
Plug-and-Play Installation & Advanced Features
The JB4 installs easily via a simple plug-and-play harness, allowing full removal without permanent modifications. It features on-the-fly map switching from your smartphone or tablet, boost-by-gear control for improved traction, progressive water/methanol support, built-in data logging, fault code reading, and much more. No user setup is required for immediate performance gains.
CANbus Integration & Real-Time Tuning
Full OBDII CANbus functionality enables the JB4 to monitor up to 40 engine parameters in real time, including throttle position, air/fuel ratios, timing advance, and more. This allows safe, smooth, and precise power delivery while retaining stock drivability across all driving modes.
Wireless JB4PRO Connectivity
The included JB4PRO Bluetooth 4.0 adapter lets you connect your tuner to iOS or Android devices. Features include:
- Recording and analyzing vehicle performance data
- Switching between multiple performance maps
- Updating JB4 firmware for free as new maps and features are released
- Accessing advanced log analysis tools and performance estimations
The adapter fits fully inside the JB4 enclosure for weather protection and a sleek, streamlined design.
Key Features & Benefits
- Gains up to 40 wheel horsepower on stock vehicles
- Faster 0-60 times and improved quarter-mile performance
- Multiple maps for different fuel types including E85
- Plug-and-play installation, fully removable
- Reads and clears fault codes
- Boost-by-gear control for improved traction
- Controls exhaust flap operation on supported vehicles
- Smooth stock-like drivability with no impact on fuel economy
- Full CANbus integration for advanced tuning
- Non-VIN locked, designed and assembled in the USA
- Durable billet aluminum enclosure
- 5-year warranty
Vehicle Fitment
- 2017+ Alfa Romeo Giulia 2.0L 4-cylinder Turbo
- 2017+ Alfa Romeo Stelvio 2.0L 4-cylinder Turbo
Why Choose JB4?
The JB4 remains the gold standard for plug-and-play turbo tuning. It delivers real power gains comparable to ECU reflashes but without permanently altering your vehicle or triggering ECU flags. With ongoing free firmware updates, multiple performance maps, and smartphone connectivity, the JB4 ensures your Alfa Romeo continues to perform at its peak safely and reliably.
