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.

• N55 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

How to check if you need Harness A or B: 

E Series N55 JB4

RHD Extension Harness Upgrade

BMS Data Cable (Optional)

• 2011-2013 N55 BMW E70 X5 35i/iX
• 2011-2013 N55 BMW E71 X6 35i/iX

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.

Download Install Guide

JB4 Dyno results

JB4 Only

JB4, Exhaust, E85 Fuel Dyno

JB4, Exhaust, Hybrid Turbo, E85 Fuel Dyno

E-N55-JB4-A (Harness A)

E-N55-JB4-B (Harness B)

Manufactured by

Burger Motorsports

Warranty

5 Year BMS Repair Warranty

Dimensions

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.