Description
JB4 Performance Tuner for Alfa Romeo Quadrifoglio QV – 2.9L Twin-Turbo V6
Elevate the performance of your Alfa Romeo Giulia Quadrifoglio or Stelvio Quadrifoglio with the JB4 Performance Tuner, the ultimate plug-and-play solution for the 2.9L twin-turbo V6 engine. Designed to deliver exceptional power gains, the JB4 allows your Alfa Romeo to achieve up to 80 wheel horsepower on a completely stock vehicle, significantly improving acceleration, 0–60 times, and quarter-mile performance—all while retaining smooth, factory-like drivability.
With advanced CANbus integration, multiple tuning maps, E85-compatible fuel options, and smartphone connectivity, the JB4 provides unprecedented control over your vehicle’s performance. Whether running stock or fully modified, the JB4 adapts to your setup for safe, reliable, and consistent power gains.
Built with a rugged billet aluminum enclosure and backed by a 5-year warranty, the JB4 is designed and assembled in the USA, making it the most trusted plug-and-play tuning solution for turbocharged Alfa Romeo vehicles worldwide.
Key Features & Benefits
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Up to 80whp gain on stock Alfa Romeo Quadrifoglio models
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Improves 0–60 mph and quarter-mile performance
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Preloaded JB4 Alfa-specific maps with up to 8 selectable tuning options
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E85 ethanol-compatible tuning maps for maximum power potential
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Read and clear fault codes via the JB4PRO app
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Monitor and log 40+ engine parameters in real time
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Boost-by-gear control for precise traction management in 1st, 2nd, and 3rd gears
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Full JB4PRO app support for tuning adjustments, real-time logging, and monitoring
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More advanced, functional, and safe than conventional performance chips
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Quick, plug-and-play installation with no ECU flashing or permanent modifications
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CANbus OBDII integration for precise tuning and improved performance
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Smooth, factory-like operation in all driving modes
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No change to fuel economy during normal driving
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Compatible with all factory driving modes
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Requires 91+ octane fuel for performance maps
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Not VIN-locked—can be removed and resold freely
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Durable billet aluminum enclosure for long-term protection
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Made in the USA
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Free USA shipping and 5-year warranty
Vehicle Fitment
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2017+ Alfa Romeo Giulia Quadrifoglio – 2.9L Twin-Turbo V6
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2017+ Alfa Romeo Stelvio Quadrifoglio – 2.9L Twin-Turbo V6
What Is a JB4?
The JB4 is a sophisticated plug-and-play tuner for turbocharged vehicles. Installed between the ECU and the vehicle’s sensors, it adjusts boost, timing, and fueling to deliver significantly more horsepower and torque. Using advanced CANbus integration, spark and fuel control, and Bluetooth connectivity, the JB4 ensures smooth, reliable, and efficient power delivery. With ongoing free firmware and map updates, your tuner evolves with your vehicle, and it can be removed at any time without leaving a trace.
Is the JB4 a Real Tune?
Yes. By tapping into CANbus and engine sensors, the JB4 provides real-time adjustments to boost, ignition timing, air-fuel ratios, and fuel trims—similar to a professional ECU reflash but without altering the factory ECU. This ensures smooth, safe, and powerful performance while retaining all factory safety features.
