Power gains of up to 40hp to the wheels on a stock vehicle

The JB4 is the most advanced and highly featured tuning system available for your 2017+ Alfa Romeo Giulia or Stelvio 2.0L 4-cylinder turbo. Power gains are up to 40hp to the wheels (55hp crank) on a completely stock car on pump gas, gains with bolt-on parts, higher octane, and larger turbos are even higher.

The JB4 features a simple plug & play harness for easy installation & removal and includes many features not found with any other tune. Including on the fly map switching from your phone/tablet instead between 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. 

The JB4 also does not require any user setup or customization but for those who are interested in logging, adding new features as we post them, etc., we suggest the BMS DATA cable or REV3 mobile phone adapter. 

Wirelessly connect the JB4 to your Bluetooth 4.0 compatible iOS and Android device via the JB4 Mobile connect kit or to 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 & Benefits

• Power gains of up to 40hp to the wheels on a stock vehicle

• Improves 0-60 times and 1/4 mile times

• Preloaded with custom JB4 Alfa Romeo 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

• 5-Year warranty

Vehicle Fitment

• 2017-Present Alfa Romeo Giulia 2.0L 4 cylinder Turbo

• 2017-Present Alfa Romeo Stelvio 2.0L 4 cylinder 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 the 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.

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