This quick install plug and play tuner connects to four 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. Power gains range from 30-60whp depending map. On racing fuel or E85 mixtures even higher gains are possible.

NOTE: 2019+ C300 models have changed to new SENT pressure sensors and require a unique JB4 system, LINKED HERE. Right now we believe all other 2019+ systems C400, C450, C43, etc, continue to use the older pressure sensors, but expect at some point in the future they will also migrate over. We’ll update the model year compatibility details as we receive them.

Wirelessly connect the JB4 to your Bluetooth 4.0 compatible iOS and Android device via the JB4 Mobile connect kit, or to 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. Separate JB4 Mobile app purchase also required.

FEATURES AND BENEFITS

• Power gains range from 30-60whp on pump gas and much more on higher octane or E85 mixtures.
• Quick Plug & Play Installation
• CANbus integration offering unrivaled tuning features and performance
• Runs as smoothly as stock, this is how your BMW 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
• Ethanol (E85) compatible tuning maps
• Able to read/delete fault codes
• Not VIN locked, can be removed without a trace and resold down the road
• Made in the USA
• Free USA Shipping
• 5 year warranty

Download JB4 iPhone App

Download JB4 Android App

DYNO RESULTS