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Pricing
EUR 1,342
USD 1,546 · UAH 71,136
The JB4 is a plug-and-play tuner that attaches to easy-to-access sensors in the engine bay and works with your factory ECU tuning to remap your boost, timing, and fueling for optimal performance and reduced turbo lag. Including maps for pump gas, race gas, and ethanol fuel mixtures up to 30% E85.
This is how your MC20 should have come from the factory! JB4 installation is discreet and quickly removes without a trace when needed. Fuel economy during normal driving is unchanged. Compatible with all driving modes.
Made in the USA and includes a 5-year warranty. 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.
