N54 JB4 BMW Performance Tuner – Maximum Power, Total Control, OEM-Level Integration

Unlock the full performance potential of your BMW N54 engine with the JB4 Performance Tuner, the industry’s most advanced and trusted plug-and-play tuning solution. Engineered for enthusiasts who demand both power and reliability, the JB4 delivers unmatched horsepower gains, adaptive tuning intelligence, and a suite of motorsport-grade features—while maintaining the smooth drivability and refinement expected of a factory-built vehicle.

Whether your BMW is completely stock or fully modified with upgraded turbos, the JB4 adapts dynamically to extract maximum performance. Expect gains of up to 80whp on a stock car, up to 160whp on factory turbos, and up to 350whp on heavily-modified, big-turbo builds. Installation is simple thanks to a complete plug-and-play harness compatible with all N54 ECU versions and transmission types.

Advanced Tuning Technology

The JB4 offers multiple performance maps that can be switched instantly from the driver’s seat, as well as a full stock bypass map and valet mode for ultimate flexibility. Its powerful features include:

• Ethanol (E85) compatible maps

• Progressive water/methanol injection support

• Dedicated race-fuel mapping

• Real-time auto-tuning that adapts to climate, octane, vehicle condition, and installed modifications

• User-configurable RPM-based mapping for custom setups

With CANbus OBDII integration, the JB4 accesses critical engine data for unparalleled tuning precision, safety, and performance—far beyond what standard piggyback systems can offer.

Motorsport Features & Driver Enhancements

Take full control of your N54 with features designed to enhance driving performance on both street and track:

• Optional in-dash boost and parameter gauges

• Programmable shift-light

• Adjustable torque limiting for improved launches

• Optional 2STEP launch control & no-lift shifting (manual transmissions)

• Optional speed limiter removal

• Real-time data logging, fault reading, and code clearing

Future-Proof Performance

No additional modifications are required for installation—simply plug in the JB4 and drive. As you continue to upgrade your vehicle, the JB4 evolves with your build. Whether running pump gas on a stock car or pushing a 700whp single-turbo setup, the JB4 provides the flexibility and tuning intelligence needed to optimize performance safely and consistently.

Proudly designed and assembled in the USA, the JB4 includes a 5-year warranty and free firmware updates as new features and performance maps are released.

Wireless Connectivity & Data Control

Pair the JB4 with your compatible device for total control:

• Bluetooth 4.0 (iOS & Android) via the JB4 Mobile Connect Kit

• Windows laptop via the BMS data cable

Use the JB4 app (sold separately) to log data, update firmware, adjust maps, and unlock additional tuning customization.

Legal Notice

This product is not CARB-exempt and is not legal for sale or use in California.

N54 JB4 Features & Benefits

• Gains of up to 100hp/100tq at the wheels on a stock N54

• Faster 0–60 and ¼-mile acceleration

• Preloaded with up to 8 maps for various fuel types and modifications

• More performance, safety, and functionality versus typical plug-in chips

• Quick plug-and-play installation

• Full CANbus integration for unmatched precision

• Smooth, OEM-like drivability

• Works with all factory driving modes

• No change in fuel economy during normal driving

• Full compatibility with JB4 Mobile for tuning and data logging

• Supports 91+ octane and ethanol-blended fuels

• Read and delete fault codes

• Not VIN-locked; removable and resale-ready

• Made in the USA

• Free USA shipping

• 5-year warranty

Vehicle Fitment

BMW 1 Series

• 2008–2010 E82 135i Coupe

• 2008–2010 E88 135i Convertible

• 2011 E82 1M

BMW 3 Series

• 2006–2010 E90 335i Sedan (incl. xDrive)

• 2006–2010 E91 335i Touring (incl. xDrive)

• 2006–2010 E92 335i Coupe (incl. xDrive)

• 2007–2010 E93 335i Convertible

• 2011–2013 E92 335is

BMW 5 Series

• 2008–2010 E60 535i Sedan (incl. xDrive)

• 2008–2010 E61 535i Touring (incl. xDrive)

BMW X Series

• 2008–2010 E71 X6 xDrive35i

BMW Z Series

• 2009–2016 E89 Z4 sDrive35i / sDrive35is

What is the JB4?

The JB4 is a plug-and-play tuning system for turbocharged vehicles, designed to enhance performance by intercepting and optimizing signals between the engine’s sensors and the DME/ECU. With advanced connection points—including CANbus, fuel and spark control, and wireless connectivity—the JB4 delivers performance and features no other piggyback tuner can match.

Featuring constant development, free firmware updates, and the ability to transfer between vehicles without VIN-locking, the JB4 remains the gold standard in turbocharged performance tuning for more than a decade.