Power gains of up to 80hp on a stock vehicle!

The JB4 is the most advanced and highly featured tuning system available for your 2017+ Alfa RomeoQuadrifoglio2.9L 6-cylinder twin turbo. Power gains are up to 80hp on a completely stock car on pump gas. Gains with bolt-on parts, higher octane, and larger turbos are even higher.

The JB4 Tuner features a simple plug and play installation harness for easy installation & removal and includes many features not found with any other tune. Includingon the fly map switching from your phone/tabletbetween factory and various performance maps, boost limiting by gear for improved traction in lower gears, progressive water/methanol support, built-in data logging, built-in code reading, and much more.

Wirelessly connect the JB4 to your Bluetooth 4.0 compatible iOS and Android device via the JB4 Mobile connect kit or your Windows laptop with the BMS data cable. Both options allow you to record and analyze vehicle and tuning data, change JB4 performance maps, and update JB4 firmware as we release free newer versions with updates, more powerful maps, and new features under development. A separate JB4 Mobile app purchase is also required.

JB4 Features and Benefits

Power gains of up to 80hp to the wheels on a stock vehicle
Improves 0-60 times and 1/4 mile times
Preloaded with custom JB4 tuning software and up to 8 maps for various fuel and modification levels
Ethanol (E85) compatible tuning maps
Able to read/delete fault codes
View and record up to 40 gauges/engine parameters in real-time with the JB4 app.
Boost by gear in 1st, 2nd, and 3rd can be controlled via the JB4 app for a perfect launch
Compatible with JB4 Mobile for smartphone logging, tuning changes, and adjustment
The JB4 offers a lot more performance, functionality, and safety than your average performance chip
Quick Plug & Play Installation
CANbus OBDII integration offering unrivaled tuning features and performance
Improved performance over non-integrated chip tunes
Runs as smoothly as stock, this is how your vehicle should have come from the factory
Compatible with all driving modes
Fuel economy unchanged during normal driving
91 octane fuel or better required for performance gains
Not VIN locked and can be removed without a trace and resold down the road
Includes the rugged JB4 billet aluminum enclosure for protection
Made in the USA
Free USA Shipping
5 year warranty

Vehicle Fitment

2017-Present Alfa Romeo Giulia Quadrifoglio 2.9L 6 cylinder twin turbo
2017-Present Alfa Romeo Stelvio Quadrifoglio 2.9L 6 cylinder twin turbo

What is a JB4?

The JB4 is a plug & play tune available for turbocharged vehicles. The JB4 tuner installs between your car’s sensors and its DME/ECU (computer) and manipulates vehicle performance through these connections making your vehicle much faster. While it’s not the only tuning system that operates this way, the JB4 separates itself from the competition with much more advanced connection points and processing including CANbus, fuel & spark control, Bluetooth to your smartphone, and a variety of innovative and advanced features not possible with any other system. BMS regularly publishes free mapping and firmware updates adding performance and features as ongoing development allows. In addition, the JB4 system is not VIN-locked to your vehicle and can quickly be removed and swapped between cars or resold at a later time. Often imitated but never duplicated the JB4 has been the gold standard in plug and play turbocharged performance tuning for over a decade.