Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 8 - Jul 13
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Description
Holley EFI Transmission Harness - T-56 558-481Terminator X Max ECUs on V3 Build 100 or later Holley EFI V6 Build 300 or later Features: Specs: Brand Holley EFI Connector Quantity 4 Emission Code 3 Grade Type Performance Harness Application GM Harness Type Transmission Product Type Transmission Harness Warning California Proposition 65 Application: Year Make Model Submodel
Terminator X Max ECUs on V3 Build 100 or later - Holley EFI V6 Build 300 or later
Features:
Specs:
| Brand | Holley EFI |
|---|---|
| Connector Quantity | 4 |
| Emission Code | 3 |
| Grade Type | Performance |
| Harness Application | GM |
| Harness Type | Transmission |
| Product Type | Transmission Harness |
| 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.
- Delivery to the USA:
- Standard Shipping : 3-10 business days
- If time is of the essence, please consider selecting expedited delivery for faster service.
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
4.7 ★★★★★
Based on 1768 reviews
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Product Reviews
★★★★★ 5
Tinned 14 AWG.
Size: 14 gauge silicone wire 10ft and 10ft, Color: silicone wire red and black
Tinned will not corrode as fast. Flexible and worked great for my purpose.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 20, 2026
★★★★★ 5
OMG so much better than alternative products
Size: 14 gauge silicone wire 10ft and 10ft, Color: silicone wire red and black
went to my local box store and bought both multistrand and single strand to rewire a pedal. huge issues with flexibility. bought this product and ..what a pleasure. high quality, very very flexible and well packaged.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 4, 2024
★★★★★ 5
Worked good
Worked well on my 84 115 tower of power
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 25, 2026
★★★★★ 5
Good
Good
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 30, 2026
★★★★★ 5
Great replacement parts!
Perfect fit for my 2003 Mercury Salt Water 150 2 stroke engine. Everything I needed was in the box.” “Good quality parts and saved me a lot compared to OEM.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on July 6, 2025
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