I would like to ask whether it is an ordinary signal line that does not contain any programs and protocols?

Ordinary signal line although to use this line on a laptop to tune you’ll need to download the Holley tuning software

Does this work on a holley efi sne-550-511d and does this replace the existing cable to the touchscreen?

It should work with your part number. The actual unit is the same as the 550-511. As far as where it connects, yes, you disconnect the touchscreen and connect your cable directly to the touchscreen connector ON THE EFI UNIT! then plug the other end to your USB and go to town with the Holley Desktop Software.

Does anyone know what the holley end of the plug is called? can i buy just that plug and make my own cable? $60 for a usb cable seems a bit much.

I think it's a Mizu P25 Connector, however I wouldn't be surprised if the USB cable has some electronics inside the end to convert communications.

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Holley EFI Usb/Can Harness, Sniper Tbi

Product ID: 446842810

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Details

Brand
HOLLEY EFI
Connector type
USB
Cable type
USB
Compatible devices
Automotive EFI
Special features
Weather

🔌USB/CAN connectivity

⚙️Durable, machined exterior

🛡️Corrosion resistant build

Description

⚡️ Harness the power of performance with Holley EFI – where legacy meets cutting-edge tech!

PLUG PLAY POWER - Seamless USB/CAN harness integration for instant performance gains
HOLLEY HERITAGE INSIDE - Trusted quality from a century-old leader in fuel systems
RACE PROVEN DURABILITY - Machined exterior and premium materials built to last through every race
EFFORTLESS INSTALLATION - Engineered for quick setup so you get back on the road faster
BUILT TO BRAVE THE ELEMENTS - Weather-resistant design ensures reliability in any environment

The Holley EFI USB/CAN Harness for Sniper TBI is a corrosion-resistant, weatherproof wiring solution designed for easy installation and long-lasting durability. Backed by Holley's 100+ years of fuel system expertise, this machined harness ensures reliable connectivity and performance for street, race, and marine applications.

Specifications

Manufacturer	HOLLEY EFI
Brand	HOLLEY EFI
Model	Holley EFI Usb/Can Harness, Sniper Tbi
Item model number	HOL 558-443
Exterior	Machined
Manufacturer Part Number	HOL 558-443
OEM Part Number	558-443
Special Features	Weather Resistant
Item Weight	113 g

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