Power gains of up to 100HP to the wheel on a stock Supra without the risks of flashing!

The JB4 tuner for the Toyota GR Supra Mk5 is the most advanced plug and play tuning system available for the turbocharged Supra platform. Power gains of up to 80 horsepower to the wheels (100hp crank) are possible on a completely stock vehicle running pump gas with the B58 engine. Vehicles equipped with bolt-on upgrades, higher octane fuel, E85 mixtures, or upgraded turbochargers can achieve even greater gains. Now includes the JB4PRO adapter and free app built in!

No ECU flash required and fully compatible with locked 🔒 ECUs.

The JB4 features a simple plug and play installation harness allowing fast installation and removal while delivering advanced tuning capabilities unavailable with other tuning systems. Features include map switching between stock and performance maps, optional boost gauge displays, boost-by-gear control for improved traction, progressive water/methanol integration, built-in data logging, fault code reading and clearing, optional electronic wastegate control, exhaust flapper control, and many additional advanced tuning features.

Unlike ECU flash tunes, the JB4 requires no staged upgrades or supporting modifications. Install it as your first upgrade and immediately experience stronger acceleration, faster turbo response, and smoother power delivery.

Note: In-dash commands have not yet been developed for the Supra JB4.

Wirelessly Connect to your JB4: Our all-new JB4 PRO smartphone connection is included to wirelessly connect the JB4 tuner to your Bluetooth 4.0 compatible iOS or Android device. This option allows 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. Our new adapter fits fully inside the JB4 enclosure for enhanced weather protection and a more streamlined look. The JB4PRO Free app features an intuitive easy-to-use interface, help buttons, and advanced log analysis tools that can estimate the performance of your car and help identify any tuning concerns.

For more information about the JB4PRO mobile app click here.

JB4 Features & 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 Supra 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 

• Optional: For Extra Ordinary Performance with JB4 We recommend Our B48 Downpipe and B58 Downpipe

Vehicle Fitment

Toyota 
• 2020-Present Toyota GR Supra Mk5 B58 3.0L 6 cyl.
• 2020-Present Toyota GR Supra Mk5 B48 2.0L 4 cyl.

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.

DYNO RESULTS / DYNO VIDEO

2020+ Toyota Supra Mk5 Dyno Results

2020+ Toyota Supra 3.0L JB4 Install Video