This proprietary USB cable links your JB4 control box to a laptop, enabling datalogging, map uploads, and advanced tuning via JB4 software (available at n54tech.com).
🔌 Flexible Installation:
Route through window/door for quick access
Or tuck behind ECU into glove box for a clean, permanent setup
⚠️ Important:
Standard RS232/USB cables are incompatible and may damage the processor