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BMW E Series N55 JB4 (135i, 335i and X1) Performance Tuner

BMS BMW N55 E82 E84 E90 E92 JB4 (135i, 335i & X1)


  • £509.00
    exc. VAT £424.17
  • 2

Compatibility Check - Enter the last 7 digits of your VIN. We will double check compatibility for you before dispatching!

In Stock

Finally a JB4 for your N55 "Twin Power" BMW! 


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


Ready to take your twin turbo 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 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 customisation but for more advanced enthusiasts the BMS DATA cable allows you to connect via a laptop for data logging and free software updates.


How to check if you need Harness A or B: 

Harness A or Harness B


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.


In the box: 

E Series N55 JB4

RHD Extension Harness Upgrade

BMS Data Cable (Optional)



BMW 1 Series
• 2011-2013 N55 BMW E82 E88 135i

BMW 3 Series
• 2011+ N55 BMW E90 E91 E92 E93 335i/ix

BMW X Series
• 2011+ N55 BMW X1



5 Year BMS Repair Warranty


Manufactured by

Burger Motorsports


Part Number

E-N55-JB4-A (Harness A)

E-N55-JB4-B (Harness B)


Download Install Guide


JB4 Dyno results

BMW E Series N55 JB4 (135i and 335i) JB4 Only Dyno
JB4 Only


BMW E Series N55 JB4 (135i and 335i) JB4, Exhaust, E85 Fuel Dyno
JB4, Exhaust, E85 Fuel Dyno


BMW E Series N55 JB4 (135i and 335i) JB4, Exhaust, Hybrid Turbo, E85 Fuel Dyno

JB4, Exhaust, Hybrid Turbo, E85 Fuel Dyno


JB4 Optional Phone Software


JB4 135i 335i Steering Wheel Controls Demo Video


JB4 Optional In Dash Boost Gauge / Shift Light Demo


JB4 Optional Startup Gauge Sweep


Click here for the latest JB4 firmware, map guide, and details.



 E-N55-JB4-B (Harness B) - 26 x 16 x 6 cm



 E-N55-JB4-B (Harness B) - 525 g

Next Day UK Delivery

Get FREE Guaranteed next day UK delivery for orders over £50 (exc. VAT) on all in stock items. Same day dispatch available if your order is placed before 11:00 GMT on all in stock items!

Worldwide Shipping

We ship worldwide via DHL International, simply enter your full address at checkout to see the shipping option(s) and quote(s). Same day dispatch available if your order is placed before 11:00 GMT on all in stock items!

Customer Reviews

5 Based on 2 Reviews
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Allan A.
United Kingdom

335 upgrade

What can I say about MLP, from the off the knowledge and assistance has been first class, always ready to assist in any way possible the prices are reasonable and they are always ready to help day "or night" the level of willingness and communication doesn't stop. I can't rate them highly enough.

Nicholas H.
United Kingdom

Feels like a new car

Found the N55 good but lacking power! this item was easy to install within about 20 mins, completely changed the car, without reducing fuel economy.