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Description
Holley EFI CAN Input/Output Module - Without Harness 554-166Adds Up To Eight Inputs and Outputs Features: This module is perfect for anyone wanting their Holley EFI ECU to control more functions or monitor more data channels1 HP and Terminator X EFI installations with only 4 inputs and 4 outputs can now add more functionality to their EFI system! 2 Quickly expand Dominator ECU? s Input Output control with 8 additional inputs and outputs3 The 554 165 kits contain a pre terminated CAN Harness, allowing you to
Adds Up To Eight Inputs and Outputs
Features:
- This module is perfect for anyone wanting their Holley EFI ECU to control more functions or monitor more data channels1
- HP and Terminator X EFI installations with only 4 inputs and 4 outputs can now add more functionality to their EFI system!2
- Quickly expand Dominator ECU?s Input / Output control with 8 additional inputs and outputs3
- The 554-165 kits contain a pre-terminated CAN Harness, allowing you to quickly install the Holley EFI CAN Module to any existing Holley EFI installation.4
- Inputs can be used for things such as:5
- -Switch 12v Toggle Switches - can be configured for external mechanical relays, or setup as digital switches via a Holley EFI dash6
- -Ground input for brake pedal switch7
- -5v analog inputs for sensors like fuel pressure, oil pressure, or nitrous bottle pressure8
- -Thermistor inputs for Coolant temperature sensors9
- Outputs can be used for things such as:10
- -Switch Low (Ground) ? For relay control or activation11
- -Switch Low PWM (Ground) ? PWM Fan control ? PWM Fuel Pump control - or other PWM- controlled devices.12
Specs:
| Brand | Holley EFI |
|---|---|
| Emission Code | 5 |
| Product Type | CAN Input Output Module |
| Warning | California Proposition 65 |
Application:
| Year | Make | Model | Submodel |
|---|---|---|---|
Shipping Notes
- Free Standard Shipping on $100+ Orders to the USA.
- Except Preorder products are shipped in 48 hours.
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Exchange/Return Notes
- We offer a 30-day return/exchange service after receiving.
- Final sale items are not eligible for returns or exchanges.
- To process your return/exchange, please contact us at [email protected]
- Please click here for more details>>> Return & Exchange Policy
4.1 ★★★★★
Based on 25 reviews
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Product Reviews
★★★★★ 5
Hermoso
Color: G9901: Gold band & Gold dial
Una belleza de reloj , el mejor que le e regalado a mi esposo calidad y belleza
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Reviewed in the United States on February 27, 2026
★★★★★ 5
Muy lindo
Color: G9901: Gold band & Gold dial
Es un regalo pero todavía no se ha husado espero q sea bueno
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Reviewed in the United States on February 8, 2026
★★★★★ 5
Look and feel awesome!
Size: 11.5, Color: Optic White/Opti
These are awesome shoes - look great really, really white and clean! Love how comfortable they are - and soooo light. I was a little worried they'd get dirty easily, but I've been able to keep them clean. Fit as expected. If you're looking for a great, comfortable, and affordable shoe, check these out!
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Reviewed in the United States on December 4, 2025
★★★★★ 5
Great shoe, comfort
Size: 11.5, Color: British Tan/Ivry
Love these shoes, they're super comfy. Laces stayed tied all day. I wear them in a business casual environment, or if I'm going out for a nice meal with my wife. They look good, the color is unassuming and neutral. they also elevate my height, I feel like it gives me an inch or so more versus regular shoes. This is my second pair!
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Reviewed in the United States on May 30, 2026
★★★★★ 5
Good shoes
Size: 7, Color: British Tan/Ivry, Size: 7, Color: British Tan/Ivry
Look very nice these shoes, speally to go out to dinner with the family, are really light weight, great quelith, and great softness
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Reviewed in the United States on April 8, 2026