JB4 Group 4: VW Performance Tuner The JB4 is a true user adjustable plug and play solution for Gen3 Jetta GLI and Turbo Beetle. Power Gains starting at 55bhp and 60ft-lb with 91 octane/95Ron with + 4.0 psi boost over stock on the default setting.

Up to 80bhp and 80ft-lb with bolt-on modifications, higher octane, and boost adjustment with the optional wireless JB4PRO Bluetooth connection.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 wireless JB4PRO Bluetooth connection providing for full in-car engine parameter display, map switching, and adjustment The JB4 can also be stacked over flash tuning allowing for fine-tuning as well as water/methanol control with safety measures in place and full logging. Adjustment procedure, software download, and further information can be read here: http://forums.vwvortex.com/showthread.php?8823666-JB4-information-thread-for-Jetta-GLI-2013-5-and-up-derivates-and-Jetta-1-8T The JB1 and JB4 are compatible with all the below models and have been tested in all markets and on all year models.

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.