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. For more advanced enthusiasts the BMS DATA or JB4 Mobile cable allows you to connect a laptop or smart phone for additional gauges, data logging, and free firmware updates as we add new features and maps.
The JB4 is a fully plug and play device that installs and removes in minutes at home without special tools and unlike flash maps that permanently write over your DME with the JB4 your DME is never aware it's running more than the factory power levels. And when you're ready to change things up the JB4 is not VIN locked and can be moved to your next vehicle or resold. Made in USA. 5 Year Warranty.
Note for electronic wastegate models the EWG add on connector remains optional and can be purchased separately from our upgrades for higher HP applications where direct EWG control is beneficial such as those using an integrated WMI kit or larger turbo.
Note for 2018+ G chassis vehicles with the digital dash layout we have not yet added in the JB4 commands to allow in dash control but will provide those via a free firmware update once developed. Until then a JB4 mobile adapter or BMS data cable is required for any map and setting changes. Also note 535, 640, and some X chassis models need to use a JB4 mobile adapter or BMS data cable to select FutureUseD bit#1 on to enable the in dash controls for those models.
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
Note: Type B has a protruding clip while Type A has a smooth clip. Please double check BEFORE ordering and if you can not positively identify your sensor email us a photo so we can identify it for you.
• 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
F Chassis N55 JB4 Applications
BMW 1 Series
• 2012+ N55 BMW F20 F21 M135
BMW 2 Series
• 2014+ N55 BMW F22 F23 M235i
• 2016+ N55 BMW F87 M2
BMW 3 Series
• 2012+ N55 BMW F30 F31 335i/ix
• 2013+ N55 BMW F34 335i xDrive GT
BMW 4 Series
• 2014+ F32 F33 F36 435i / 435ix
BMW 5 Series
• 2010-2016 N55 BMW F10 F11 535i/ix
• 2010-2015 N55 BMW F07 535i/ix GT
BMW 6 Series
• 2011+ N55 BMW F12 F13 640i/ix
• 2011+ N55 BMW F06 640i/ix Gran Coupe
BMW X Series
• 2010-2015 N55 BMW X1
• 2014+ N55 BMW F25 X3
• 2014-2018 N55 BMW F15 X5 F16 X6
• 2017+ N55 BMW X4 M40i
E Chassis N55 JB4 - Click Here
F32 435i with BMS intake, exhaust
F22 M235i with intake, exhaust
F30 335i with BMS intake, exhaust
Change maps on the fly
Control your roar! Open and close your exhaust flapper valves.
JB4 N55 EWG install video
JB4 N55 PWG install video