How about up to 60hp to the wheels (80hp crank) on a completely stock car or up to 100hp to the wheels (120hp crank) on a fully modified car? The JB4 features a simple plug and play installation harness for easy installation and includes many features not found on any other tune. Including on the fly in dash map switching between factory and various performance maps, optional in dash gauge displays for boost and other critical engine parameters, progressive water/methanol support, ethanol fuels support, built in code reading, and much more.
Remember the JB4 does not require any additional modifications or previous stages. Simply install the JB4 as your first and only modification and enjoy an entirely new fast and smooth racing experience. The JB4 also does not require any user setup or customization but for more advanced enthusiasts the BMS DATA cable allows you to connect via a laptop for data logging and free software updates.
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.
Click here for the latest JB4 firmware, map guide, and details.
How to tell if you need harness A or B
Features and benefits
• Power gains of up to 60hp and 60tq to the wheels on a stock vehicle
• Quick Plug & Play Installation
• CANbus integration offering unrivaled tuning features and performance
• Runs as smoothly as stock, this is how your N55 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
BMW 1 Series
• 2011-2013 N55 BMW E82 E88 135i LHD
BMW 3 Series
• 2011 N55 BMW E90 E91 335i/ix
• 2011-2013 E92 E93 335i/ix
BMW X Series
• 2011-2016 N55 BMW X1
F Chassis N55 JB4 - Click Here
JB4, Exhaust, E85 Fuel
JB4, Exhaust, Hybrid Turbo, E85 Fuel
Optional JB4 Phone Software
JB4 Optional Startup Gauge Sweep
JB4 Optional In Dash Boost Gauge / Shift Light Demo
JB4 135i 335i Steering Wheel Controls Demo Video