Sealed USB Cable

The Holley sealed USB cable (model 558-409) is a professional-grade data transfer solution designed for EFI tuning, engine management systems, and diagnostic applications. Built specifically for Holley EFI kits, this sealed mini USB cable provides a reliable hardwired connection between your engine control unit and tuning software. The sealed design protects against moisture, dust, and environmental contaminants—critical for under-hood installations where vibration and weather exposure demand durability.

This 7-foot sealed USB cable features a mini USB connector engineered for secure, repeated connections without signal degradation. The extended length allows flexible routing through engine bays, dash tunnels, and firewall penetrations, eliminating the need for extension adapters that introduce resistance and potential failure points. The sealed construction uses ruggedized connectors and shielded conductors to minimize electromagnetic interference—essential when running communication cables near high-voltage ignition systems and fuel injection electronics. A compact footprint (4.5 × 3.2 × 4.9 inches) ensures easy storage and transport without tangling.

Professional tuners, engine builders, and Holley EFI system owners benefit most from this cable's reliability and weather resistance. Whether you're performing initial system configuration, live data logging during dyno sessions, or routine diagnostic updates, the sealed design eliminates environmental risk in both shop and track environments. Compatible with all Holley EFI kits featuring mini USB input ports, this cable is an essential component for anyone requiring consistent, trouble-free communication with their electronic fuel injection system.