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Shipping Estimate
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- USA
- CAN
Ships within 48 hours · Estimated delivery Aug 8 - Aug 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
4.8 ★★★★★
Based on 9 reviews
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Product Reviews
★★★★★ 4
Don't buy if your cat is plugged
Size: 2-Pack
The product works just not for long I followed the directions even added 2 it worked good until I filled up the vehicle with fuel
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2026
★★★★★ 5
Great Product
Size: 2-Pack
Great product, worked wonders!! I would definitely recommend to others to buy this product!!
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Reviewed in the United States on April 5, 2026
★★★★★ 1
Disappointed
Size: Single
It didn’t work as expected
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Reviewed in the United States on May 30, 2026
★★★★★ 1
Fake
Size: 2-Pack
No good just a lie
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Reviewed in the United States on April 13, 2026
★★★★★ 4
Good parts
They fit
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Reviewed in the United States on May 5, 2026