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BMS

Burger Motorsports (BMS) JB4 Tuning Box for BMW N55 E-Series (E82 E88 E90 E91 E92 E93 E84 E70 E71) - 135i 335i X1 X5 X6 - Plug & Play Piggyback ECU

Burger Motorsports (BMS) JB4 Tuning Box for BMW N55 E-Series (E82 E88 E90 E91 E92 E93 E84 E70 E71) - 135i 335i X1 X5 X6 - Plug & Play Piggyback ECU

£523.64
£479.00 £523.64
Sale Sold out
Shipping calculated at checkout.
Harness Type (A or B)

Heads-up on cancellations & returns: if you cancel an order or return an item, you won't get back 100% of what you paid. We apply a 10% restocking fee, the outbound shipping is non-refundable, and we have to pass on Shopify / PayPal payment processing fees; these aren't returned to us when we refund you. International orders also lose on exchange-rate spread in both directions. If the original packaging is damaged or missing, a reboxing charge applies. For international orders specifically, if you refuse to pay our shipping invoice or supply a prepaid label after placing the order, the same deductions apply. We're upfront about this — please be sure of your purchase before ordering.

JB4 Performance Module for BMW N55 E-Chassis 135i 335i X1 X5 X6

Instantly wake up your turbocharged N55 with the Burger Motorsports JB4 performance module. This simple plug-in engine control add-on delivers huge real-world gains with factory-like drivability, seamless CAN integration and industry-leading safeguards. On a standard vehicle you can see up to 60 hp and 60 lb ft at the wheels, and with supporting hardware the platform is capable of around 100 whp increases, all while retaining smooth OEM manners.

We run JB4 on our own cars and have installed it for countless happy customers. The difference is immediate: sharper response, harder midrange pull and repeatable acceleration run after run. If you are searching for a BMW N55 power upgrade without permanent ECU flashing, this is the proven route to faster 0 to 60 and a stronger standing quarter.

Key reasons enthusiasts choose JB4

  • Up to 60 hp and 60 lb ft at the wheels on an otherwise stock setup
  • Up to 100 whp potential on cars with supporting modifications
  • In-car map switching and optional in-dash gauge hijack for boost and key data
  • OBD CAN connectivity for advanced control, safety and code reading or clearing
  • Ethanol blend and progressive water meth compatibility
  • No cutting or splicing, fully reversible and not VIN locked
  • Runs as smoothly as stock in every drive mode with economy unchanged in normal use
  • Optional JB4 Mobile app via Bluetooth or laptop cable for logging, updates and tweaks
  • Premium unleaded recommended for best results
  • Rugged billet aluminium enclosure, made in the USA, 5 year BMS repair warranty

Looking for a flash tune alternative, ECU upgrade, chip tuning or a BMW power box for your N55 straight-six turbo? JB4 is the benchmark.

Vehicle compatibility

BMW 1 Series

  • 2010 to 2013 E82 E88 135i with N55

BMW 3 Series

  • 2010 onward E90 E91 E92 E93 335i and 335ix with N55

BMW X models

  • 2011 onward E84 X1 with N55
  • 2011 to 2013 E70 X5 35i and 35ix with N55
  • 2011 to 2013 E71 X6 35i and 35ix with N55

Harness selection A or B

Your N55 may require Harness A or Harness B. Use the guide below to identify the correct option for your car or contact us for assistance.

JB4 harness A or B identification guide for BMW N55

What you get

  • E-chassis N55 JB4 control unit in billet aluminium housing
  • Model specific JB4 wiring loom
  • Right-hand-drive extension harness upgrade
  • BMS Data Cable if selected

Recommended add-ons

  • BMS Data Cable for laptop connectivity, data logging and firmware updates
  • Bluetooth Connect Kit for JB4 Mobile app control and wireless logging

Installation and fitting

Straightforward plug-in installation with no permanent changes to the vehicle. Most owners fit at home with basic tools using the official guide.

Prefer professional fitting and setup? MJ Modifications offers expert installation in Warwickshire. Email info@mjmodifications.co.uk for a quote and availability.

Compatibility check before dispatch

We validate compatibility before shipping. Add your UK registration number or the last 7 characters of your VIN at checkout so we can confirm the correct harness and configuration.

Part numbers

  • E-N55-JB4-A Harness A
  • E-N55-JB4-B Harness B

Warranty and manufacturer

Manufacturer: Burger Motorsports

Warranty: 5 year BMS repair warranty

Dimensions and weight

  • E-N55-JB4-B approximate dimensions: 26 x 16 x 6 cm
  • E-N55-JB4-B approximate weight: 525 g

Dyno and videos

JB4 Optional Phone Software

JB4 135i 335i Steering Wheel Controls Demo Video

JB4 Optional In Dash Boost Gauge and Shift Light Demo

JB4 Optional Startup Gauge Sweep

Search phrases our buyers use

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