What is a JB4? 

The JB4 is a plug and play tune available for turbocharged vehicles. The JB4 tuner installs between your car's sensors and its DME/ECU (computer) and manipulates vehicle performance through these connections making your vehicle much faster. While it's not the only tuning system that operates this way the JB4 separates itself from the competition with much more advanced connection points and processing including CANbus, fuel & spark control, Bluetooth to your smartphone, and a variety of innovative and advanced features not possible with any other system. BMS regularly publishes free mapping and firmware updates adding performance and features as ongoing development allows. In addition, the JB4 system is not VIN locked to your vehicle and can quickly removed and swapped between cars or resold at a later time. Often imitated but never duplicated the JB4 has been the gold standard in plug and play turbocharged performance tuning for over a decade.

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The X4 Performance Programmer connects high-performance tunes to your vehicle for an immediate boost in horsepower and torque. Awaken your engine to its real potential with preloaded, dyno-proven tune files through the easy-to-use functionality. Modify a variety of parameters at the touch of a button, all while monitoring gauges on a customizable display.

Features:
TUNER/MONITOR: Read vehicle data on a full-color LCD display
PERFORMANCE: Preloaded, dyno-proven tunes boost power & torque
DIAGNOSTIC TOOL: Read and clears DTC (Diagnostic Trouble Codes)
CUSTOM TUNING: Load up to 10 custom tune files
50 State Legal
User Adjustable Tune Options
Backs Up Factory Tune
User adjustable Vehicle Parameters
High Speed Data logging & monitoring
Installs quickly and easily

Carb EO: D-784-10
Carb EO: D-784-11
Carb EO: D-784-12
Carb EO: D-784-13
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