Site Information

 Loading... Please wait...
FREE Standard Shipping on Most U.S. Orders Details
  • Image 1
  • Image 2
  • Image 3

BMS N55 JB4 Performance Tuner | BMW F Chassis

Our Price:
Mgf Part #:

Other Details

1 Year MFG
* Type:
  • Best Prices. Price match guarantee
  • Authorized Dealer. Manufacturer warranty backed
  • In House Experts. We know products
  • Amazon Payments. Pay with your Amazon account

Product Details

Ready to take your F Chassis BMW N55 turbo 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 drivers 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 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 in around 15 minutes and unlike flash maps that permanently write over your DME with a JB4 your DME is never aware it's running more than the stock power levels. And when you're ready to change things up the JB4 is not VIN locked so it can be resold or moved to your next vehicle.

Note the EWG add on connector remains optional and can be purchased separately from our upgrades for higher HP applications where direct EWG control is required such as those using an integrated WMI kit or larger turbo.




Fitment Guide


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

  • 2011+ N55 BMW F10 F11 535i/ix
  • 2010+ 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

  • 2014+ N55 BMW F15 X5


Installation Information

Installation Time

(approx) 20 Minutes

Difficulty Level

Simple installation for anyone

Installation Guides

How to Install

Product Videos

JB4 S55 CAN Flap DEMO #3 - Software v3.10 03:03

  • JB4 S55 CAN Fl...
  • JB4 F Series M...
  • JB4 Add-On Blu...
    Note boost on fuel gauge is also enabled on this run. Result w...

Product Reviews

Write Review

This product hasn't received any reviews yet. Be the first to review this product!

Click the button below to add the BMS N55 JB4 Performance Tuner | BMW F Chassis to your wish list.