JB4 Group 18: JB4 for EA888 Gen4 for Mk8 Golf R, Audi S3 8Y, Cupra Leon/Formentor The JB4 is a true user adjustable plug and play solution. Power Gains: Starting at peak 370bhp and 380ft lb.The JB4 features CANbus connectivity for more advanced tuning, direct AFR control, advanced safety systems for boost, air/fuel ratio, fuel trims, and engine knock, boost mapping by gear for improved traction, integrated water/meth control, and much more.

The unit can be used with our JB4 Bluetooth Connect kit providing for full in-car engine parameter display, map switching, and adjustment. Stored maps available for 91/95ron and 93/98ron for manual and DSG Wirelessly Connect to your JB4: Grab our all-new JB4 PRO smartphone connection to wirelessly connect the JB4 BMW 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.

Vehicle Fitment

Volkswagen
2025+ Mk8.5 Golf R
2021+ VW MK8 Golf R
2021+ VW MK8 GTI Clubsport
2021+ VW Tiguan R
2022+ ArteonAudi
2021+ Audi S3 8Y
2021+ Audi SQ2Seat
2021+ Seat Cupra Leon
2021+ Seat Formentor

Group 18: JB4 for EA888 Gen4 for Mk8 Golf R, Audi S3 8Y, Cupra Leon/Formentor

AI view of this part

Vehicle Fitment