The Holley EFI CAN splitter lets you add an additional CAN device to an HP, Dominator, Sniper 1, or Terminator X installation without unplugging the handheld. It plugs directly into the CAN connector on the main harness, freeing up a port for a Digital Dash, USB-to-CAN communication cable, or other Holley EFI CAN device.
Specifications:
- Product Type: CAN Extension Harness
- Compatibility: HP, Dominator, Sniper 1, Terminator X
- Connectors: 3
- Construction: Wires in protective sleeve
- Part Number: 558-465
Unplug the CAN Splitter from the main harness before updating ECU firmware — plug the firmware-updating device directly into the main harness instead to prevent damage.
FAQ
What does the 558-465 CAN splitter do?
It lets you add an additional CAN device — like a Digital Dash or USB-to-CAN cable — to your installation without needing to unplug the handheld.
Which Holley EFI systems is it compatible with?
HP, Dominator, Sniper 1, and Terminator X.
Do I need to remove it when updating ECU firmware?
Yes. Unplug the CAN Splitter from the main harness and plug the firmware-updating device directly into the main harness to avoid damage.

