Group 15: JB4 for Audi EA825 4.0TT C8 RS6/7, RS Q8, SQ7/8, & Urus

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Power gains from 70hp and 100tq to the wheels on a stock vehicle without the risks of flashing!

Power gains of up to 120whp and 160wtq bring the car to life allowing 1/4 mile potential deep into the 10s. Unlike other generic tuning devices, the JB4 includes full CANbus integration via the OBDII port for advanced tuning, safety features, and diagnostics, as well as electronic wastegate control for superior boost targeting. This is simply the best tuning box available for your Audi.

Installation is fully reversible, attaching to the TMAP sensors and OBDII port. Firmware updates loaded via JB4 Mobile or a BMS Data Cable will be provided for free as we expand the JB4's performance, maps, and features with future development.

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 & Benefits

• Power gains of up to 120hp and 130tq to the wheels on a stock vehicle
• Improves 0-60 times and 1/4 mile times
• Preloaded with custom Audi tuning software and up to 8 maps for various fuel and modification levels
• The JB4 offers a lot more performance, functionality, and safety than your average performance chip
• Quick Plug & Play Installation
• Includes the rugged JB4 billet aluminum enclosure for protection
• 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
• Compatible with JB4 Mobile for smartphone logging, tuning changes, and adjustment
• 91 octane fuel or better required for performance gains
• Ethanol (E85) compatible tuning maps
• Able to read/delete fault codes
• Not VIN locked and can be removed without a trace and resold down the road
• Made in the USA
• Free USA Shipping
• 5-year warranty

Vehicle Fitment

• 2024-Present Audi C8 RS6 Performance
• 2024-Present Audi C8 RS7 Performance
• 2020-Present Audi C8 RS6
2019-Present Audi C8 RS7
• 2020-Present Audi SQ7
• 2020-Present Audi SQ8
• 2019-Present Audi RS Q8
• 2019-Present Audi S8

• 2018-Present Lamborghini Urus 

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.



SQ7/SQ8/RS Q8/S8

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JB4 Dyno Video and results

Audi JB4 Mobile demo video

JB4 Tuner Audi EA825 4.0TT C8 RS6 RS7 RS Q8 SQ7 SQ8 Dyno