JB4 Tuner for 2020+ Mercedes-Benz A35 AMG, CLA 35 AMG, GLA 35 AMG, & GLB

Power gains range from 30-60whp on pump gas and much more on higher octane or E85 mixtures. This quick install plug and play tuner connects to easy to reach plugs on top of the engine and safely increases turbocharger output by 3-6psi producing significant power and torque increases.

Timing and fueling are appropriately rescaled for the increased boost and the installation is completely reversible in seconds. Compatible with all-wheel drive and rear-wheel drive models. The JB4 is the only tuning system that includes CANbus and optional wastegate connections providing dramatically improved performance and smoothness over other 2-channel tuning systems.

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

• A-Class
• 2020+ Mercedes-Benz A35 AMG C-Class
• 2020+ Mercedes-Benz CLA 35 AMGGLA-Class
• 2020+ Mercedes-Benz GLA 35 AMG GLB-Class
• 2020+ Mercedes-Benz GLB 35 AMG
• 2020+ Mercedes-Benz GLB 250 2.0T