Sxqddz CAN Bus Y-Splitter Cable for Holley EFI MA558-465 — Shielded 4‑Wire, Compact Plug-and-Play

Sxqddz CAN Bus Y-Splitter Cable MA558-465 is a shielded 4‑wire harness that lets you connect two CAN devices—such as a handheld and a laptop—simultaneously to Holley EFI systems.

This compact, plug-and-play adapter is built to fit Holley EFI families including Sniper, Terminator X and Dominator. Designed as a direct replacement for part numbers MA558-465, 558-465, TERMX-Y6 and TERMX-Y-6, the splitter preserves signal integrity with shielded conductors and a durable jacket for reliable communications during tuning and diagnostics.

How does this Y-splitter help when I’m tuning or updating an ECU?

The splitter lets you attach more than one CAN tool at once—handheld controllers, laptops or dataloggers—without unplugging the main harness. That makes it easier to monitor live data while flashing firmware or adjusting parameters.

• Enables simultaneous connection of handheld and laptop to Holley EFI
• Shielded 4‑wire design reduces electrical noise on the CAN lines
• Plug-and-play—no soldering or modification required
• Compact size keeps wiring tidy in tight engine bays

Will this part physically fit my Holley Sniper, Terminator X or Dominator system?

Yes—this harness is listed specifically for Holley EFI Sniper, Terminator X and Dominator ECUs. It follows Holley connector conventions and plugs into the main CAN connectors for those systems.

• Direct replacement for MA558-465 / 558-465 / TERMX-Y6 / TERMX-Y-6
• Designed to mate with Holley EFI CAN ports without adapters
• Keep splitter disconnected from main harness when flashing firmware, per best practice

What are the construction and durability features of this harness?

The cable uses a shielded four‑conductor assembly to protect CAN bus signals from interference and improve longevity. Materials and assembly are intended for repeated connection cycles and typical workshop environments.

• Shielded 4‑wire cable to minimize EMI and cross-talk
• Robust connectors rated for frequent plug/unplug use
• Compact, foldable profile that saves space in wiring looms
• Manufactured new and inspected for quality prior to shipping

How should I use this splitter safely during firmware updates?

For firmware updates and certain communications tasks, plug the updating device directly into the main harness and remove the Y‑splitter. Use the splitter for simultaneous monitoring or tuning when not performing critical writes that require a single bus connection.

• Remove the splitter from main harness while flashing ECU firmware
• Use splitter for concurrent monitoring and non-critical adjustments
• Contact support if you’re unsure which device should be primary

Who this is for: technicians, tuners and vehicle owners who use Holley EFI systems and need a simple way to attach multiple CAN tools at once. It’s useful for race teams, aftermarket installers and home tuners who require reliable, noise‑resistant connections while keeping the wiring neat. If you need a straightforward replacement matching MA558-465 specifications—Sxqddz’s CAN Bus Y-Splitter offers a compact, plug-and-play option built for Holley Sniper, Terminator X and Dominator ECUs.