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

The Sxqddz CAN Bus Y-Splitter Cable MA558-465 lets you connect two CAN devices—such as a handheld and laptop—simultaneously to Holley EFI systems without modifying the main harness.

If you run Holley EFI platforms like Sniper, Terminator X, or Dominator and need to attach multiple CAN-enabled tools at once, this compact shielded 4-wire Y-splitter provides a simple, plug-and-play solution. Built to match OE-style connections and labeled with part numbers MA558-465, 558-465, TERMX-Y6 and TERMX-Y-6, the cable is designed to be durable, flexible, and easy to stow when not in use.

How does this Y-splitter work with Holley EFI systems?

The harness splits a single CAN Bus line into two branches so you can plug in a handheld controller and another CAN device concurrently. It retains the shielded 4-wire wiring required for reliable CAN communication and uses compatible connectors to mate with Holley harnesses.

• Direct fit for Sniper, Terminator X, and Dominator ECUs
• Shielding reduces electrical interference on the CAN network
• Plug-and-play—no splicing or soldering required
• Compact, flexible cable for neat routing and storage

Will this affect ECU firmware updates or diagnostics?

For firmware flashing or troubleshooting, the manufacturer recommends connecting the updating device directly to the main harness and temporarily removing the splitter. This ensures a single, direct CAN link for cleaner communication during sensitive operations.

• Remove splitter when flashing ECU firmware
• Use direct main-harness connection for diagnostic tools if instructed
• Splitter is ideal for simultaneous monitoring and handheld control during normal use

What are the build and quality features of the cable?

The Sxqddz MA558-465 is manufactured as a shielded four-conductor assembly with robust connectors, designed for repeated plugging and in-vehicle environments. The cable's small footprint and flexible jacket make routing beneath dashboards or in engine bays straightforward.

• Shielded 4-wire construction for stable CAN signals
• Durable connector housings rated for repeated cycles
• Compact form factor that folds and stores easily
• 100% new, labeled with interchangeable part numbers for easy identification

How do I ensure I order the correct part and install it properly?

Confirm your vehicle or ECU model (Holley Sniper, Terminator X, or Dominator) and match the part number MA558-465 or listed alternates before purchasing. Installation is plug-and-play: insert the splitter inline with the CAN connector and plug the two devices into the Y-branches.

• Check compatibility: MA558-465, 558-465, TERMX-Y6, TERMX-Y-6
• Plug splitter into main CAN junction; connect devices to branches
• Remove splitter for firmware updates when instructed
• Contact seller support if you’re unsure about fit or function

Who is this for? Technicians, tuners, and vehicle owners who use Holley EFI platforms and need a reliable way to connect a handheld device plus a laptop or other CAN accessory at the same time will find the Sxqddz MA558-465 useful. It’s geared toward users who want a durable, no-fuss, plug-and-play CAN extension harness that preserves signal integrity while offering tidy installation and easy storage.