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BMS BMW B58 B38 B46 B48 JB4 Tuning Box (M140i, 220i, M240i, 330e, 320i, 340i & 440i)


  • £450.00
    exc. VAT £375.00
  • 8

In Stock

Ready to take your BMW B46/B48/B58 turbo to the next level?


You may also wish to add the Data Cable or the Bluetooth Connect Kit for additional features.


How about up to 60hp to the wheels (80hp crank) on a completely stock car on pump gas for a B58 or up to 40hp to the wheels for a B48? 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, boost limiting by gear for improved traction in lower gears, progressive water/methanol support, built in data logging, built in code reading, and much more. It automatically detects between the B48 and B58 models at boot up making installation and setup a snap.

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 customisation but we strongly suggest the BMS DATA cable so you can load free software updates.



• Power gains of up to 50hp 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 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


In the box: 

F Chassis B46/B48/B58 JB4

Extended OBDII Cable for RHD cars, also fits LHD


Compatibility Check

To ensure the part(s) you have ordered fits your vehicle, we run a compatibility check prior to dispatch. We can do this either using your registration number(UK) or the last 7 digits of your VIN. Simply enter your car details prior to checkout. 



BMW 1 Series
• 2015+ B58 M140i

BMW 2 Series
• 2017+ F22 F23 B58 M240i/iX
• 2017+ F22 F23 B48 230i/iX
• 2017+ F45 B48 225i/iX 
• 2017+ F22 F23 B46 220i/iX

BMW 3 Series
• 2016+ F30 B58 340i/340iX
• 2016+ F30 B48 330i/330iX/330e (XB1H)
• 2016+ F30 B46 320i/320iX
• 2016+ F30 B38 318i/318iX 

BMW 4 Series
• 2016+ F32 F33 F36 B58 440i/440iX
• 2016+ F32 F33 F36 B48 430i/430iX 
• 2016+ F32 F33 F36 B46 420i/420iX

BMW 5 Series
• 2017+ G30 B58 540i/540iX

BMW X Series
• 2016+ X1 B46/B48
• 2018+ B46/B48 X2
• 2018+ B58 X3 M40i
• 2019+ B48 X3 xDrive 20i

Will work on most BMW with the B48 and B58 engine even if it is not on the above list, if you are unsure, please drop us an email and we would be delighted to double check for you! 


Free Next Day UK Delivery

Free next day delivery if ordered before 11am! We can also ship worldwide, simply enter your full address during checkout for a shipping quote.



5 Year BMS Repair Warranty


Manufactured by

Burger Motorsports


Part Number



BMS BMW F Chassis B46/B48/B58 JB4 (M140i, 220i, M240i, 320i, 330i, 340i, 420i, 440i & X1 ) Installation Guide - ML Performance UK


JB4 Tuned M140i


How to install B58 JB4 + Bluetooth Kit on RHD UK/Australia M140i


How to install (US - LHD)


For install guide, map guide, and the latest firmware click here.


JB4 Dyno results (Click to enlarge)

2016 BMW 340i B58, JB4, 93 Octane, Map3

BMS BMW F Chassis B46/B48/B58 JB4 (220i, 240i, 320i, 330i, 340i, 420i, 440i & X1 ) Dyno - ML Performance UK


2017 BMW 230i with B48 Engine, JB4

BMS BMW B58 B38 B46 B48 JB4 Tuning Box (M140i, M240i, 320i & 440i) - 2017 BMW 230i with B48 Engine, JB4


2016 BMW 340i B58, JB4, Pure Stage1 Turbo, 93 Octane, WMI

BMS BMW B58 B38 B46 B48 JB4 Tuning Box (M140i, M240i, 320i & 440i) - 2016 BMW 340i B58, JB4, Pure Stage1 Turbo, 93 Octane, WMI


BMS BMW B58 B38 B46 B48 JB4 Tuning Box (M140i, M240i, 320i & 440i)

BMS BMW B58 B38 B46 B48 JB4 Tuning Box (M140i, M240i, 320i & 440i) - 2016 BMW 340i B58, JB4, 93 Octane, WMI

 JB4 B48/B58 CANFlap Exhaust Flapper Test


JB4 F Series OBDII CANbus Wheel Control DEMO


JB4 Add-On Blue Tooth Phone Logging DEMO with a new 2016 BMW M4 ZCP!



26 x 16 x 6 cm




Customer Reviews

5 Based on 8 Reviews
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4 ★
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zahid k.
United Kingdom

Worth every penny!

Fantastic product, although there was mix up with the delivery (since sorted promptly). Gains of 40bhp over stock! Really helps unlock the potential of the B58.

Andy Bradley

Excellent Service

Ordered a JB4 and the Bluetooth adaptor yesterday and had it delivered today. Excellent communication and excellent service. The hand written note that came with my order was a great touch and shows why you should use ML Performance. Now to have the parts fitted.......

David D.
United Kingdom

Jb4 Bmw 330e

Great seller fast shipping and very communicative with top service orientation D

Paul A.
United Kingdom

BMW 340i JB4

I bought the JB4 along with the Bluetooth connect kit and the app download. Installation on the car itself was straight forward and didn't take very long at all. I updated the firmware directly through the app and changed a few of the settings etc before going out for a drive. I've already got a few other mods on my car and a full tank of V-Power so set the JB4 to map 3 and the difference is amazing. Much more power and torque is instantly noticeable. I've been running it now for a couple of weeks with no problems at all. Overall this is highly recommended. The service from ML Performance is also top notch as usual.

Ari Van Essen

Take your 440I Gran Coupé to the next level!

Verry happy with the performance. Installation was easy results are great! Must have for the BMW 440i Xdrive :-)