Power gains of up to 80hp on a stock vehicle without the risks of flashing!

Ready to take your F chassis N55 BMW to the next level? 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 the ability to enable/disable the tuning from the driver's seat, gear dependent boost control to help with traction, autotuning for E85 mixtures, built-in diagnostic code reading/deleting, expanded engine safety systems, free firmware updates, in-dash boost gauge, the ability to control the exhaust flapper using your BC button, and much more.

The JB4 Tuner 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 smartphone for additional gauges, data logging, and free firmware updates as we add new features and maps.

The JB4 is a full 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 the 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

*5 Series F10 models will need to check their sensor type before ordering.
This does not apply to F30 models.

*How to tell if you need harness A or B. Click Here for TMAP Location & Photos

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.

Wastegate Identification Chart. Pneumatic (PWG) or Electronic (EWG)?

JB4 FEATURES & BENEFITS 

• Power gains of up to 60hp and 60tq to the wheels on a stock vehicle
• Improves 0-60 times and 1/4 mile times
• The JB4 offers a lot more performance, functionality, and safety than your average performance chip
• Quick Plug & Play Installation
• Includes the rugged JB4 billet aluminum enclosure for protection
• CANbus OBDII integration offering unrivaled tuning features and performance
• Improved performance over non-integrated chip tunes
• Runs as smoothly as stock, this is how your vehicle 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
• 91 octane fuel or better required for performance gains
• Ethanol (E85) compatible tuning maps
• Able to read/delete fault codes
• Not VIN locked and can be removed without a trace and resold down the road
• Made in the USA
• Free USA Shipping
• 5 year warranty

APPLICATIONS

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
• 2012-2018 N55 BMW F30 F31 335i/ix
• 2012-2018 N55 BMW F30 Active Hybrid 3
• 2013-2019 N55 BMW F34 335i xDrive GT

BMW 4 Series
• 2014-2020 F32 F33 F36 435i / 435ix including Gran Coupe 

BMW 5 Series
• 2011-2016 N55 BMW F10 F11 535i/ix and ActiveHybrid 5
• 2011-2015 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 7 Series
• 2013-2018 N55 BMW F01/F02 740i/ix

BMW X Series
• 2010-2015 N55 BMW X1
• 2011+ N55 BMW F25 X3
• 2014-2018 N55 BMW F15 X5 F16 X6
• 2017+ N55 BMW X4 M40i

What is a JB4?

The JB4 is a plug and play tune available for turbocharged vehicles. The JB4 tuner installs between your cars sensors and it's DME/ECU (computer) and manipulates vehicle performance through these connections making your vehicle much faster. While it's not the only tuning system that operates this way the JB4 separates itself from the competition with much more advanced connection points and processing including CANbus, fuel & spark control, bluetooth to your smartphone, and a variety of innovative and advanced features not possible with any other system. BMS regularly publishes free mapping and firmware updates adding performance and features as ongoing development allows. In addition the JB4 system is not VIN locked to your vehicle and can quickly removed and swapped between cars or resold at a later time. Often imitated but never duplicated the JB4 has been the gold standard in plug and play turbocharged performance tuning for over a decade.

 DYNO RESULTS

F32 435i with BMS intake, exhaust

F22 M235i with intake, exhaust

F30 335i with BMS intake, exhaust

VIDEOS

Change maps on the fly

Control your roar! Open and close your exhaust flapper valves. 

INSTALL VIDEOS

JB4 N55 435i EWG install video

 JB4 N55 335i/335iX PWG install video

 JB4 N55 BMW F10 535i/535iX install video