Shipping Estimate
USA
- USA
- CAN
- USA
- CAN
Ships within 48 hours · Estimated delivery Jul 9 - Jul 14
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For Your Every Summer RSVP, with Code: SUMMER15
Description
HOLLEY EFI GEN III HEMI SMART COILS 556-163Black, 8 Pack Features: Direct bolt on to factory valve covers1 Same wiring pinout as other IGN 1A coils for easy plugin upgrades (Will not work with factory wiring)2 More spark energy than any other smart coil on the market for maximum fuel burn during combustion sequence3 Low current draw means less demand on the electrical and charging system4 Built in ignitor for compatibility with Holley EFI and many other aftermarket ECU? s5 Maximum operating
Black, 8-Pack
Features:
- Direct bolt-on to factory valve covers1
- Same wiring pinout as other IGN-1A coils for easy plugin upgrades (Will not work with factory wiring)2
- More spark energy than any other smart coil on the market for maximum fuel burn during combustion sequence3
- Low current draw means less demand on the electrical and charging system4
- Built-in ignitor for compatibility with Holley EFI and many other aftermarket ECU?s5
- Maximum operating voltage of 18 volts ? for compatibility with both 12 volt and 16 volt electrical systems found in many performance/race applications6
Specs:
| Brand | Holley EFI |
|---|---|
| Category Filter | Ignition |
| Clearance Category | Ignition |
| Coil Type | Holley SmartCoil |
| Color | Black |
| Emission Code | 3 |
| Grade Type | Performance |
| Product Type | Coil |
| 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 372 reviews
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Product Reviews
★★★★★ 5
Great
Works great, as long as you don’t lean of one edge too much
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026
★★★★★ 5
Good roller
Sturdy and strong. Rolls smooth. I used it to put down sound deadener in my classic car. Sometimes you think cheap is cheap but this is a good one.
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Reviewed in the United States on April 12, 2026
★★★★★ 5
Great value great quality.
Very good quality made and very good price.
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Reviewed in the United States on May 26, 2026
★★★★★ 5
Makes For Quiet Rides
Model: 10 SqFt(0.95 SqM)
Comparable quality and performance to name brand competitor. It sticks on strong, easy to apply, and does make a difference in sound reduction. Turn your hollow shell sounding vehicle panels into solid sounding walls.
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Reviewed in the United States on March 15, 2026
★★★★★ 5
Must for subwoofers. True 2mm spec. High quality.
Model: 36 SqFt(3.4 SqM), Model: 36 SqFt(3.4 SqM)
Let me start of by saying WOW! This made a huge difference in the SQ of my L7S pushing 930w rms. Before I had major rattles in my 2020 Honda Civic SI. Taking the time to do this to my trunk and Lid made me realize just how loud my subwoofer actually is. It literally eliminated the rattles throughout my whole car. I still plan on doing this to my doors and rear deck but once I upgrade the speakers. I still have half of the box just doing the trunk and lid so 1 box of 36sf will be enough for most of the areas that need to get done. You may need a little more overall. This is true 2mm spec. Very sticky and easy to apply. It just take time to finish the work correctly and roll it down. It is not as heavy as I thought it was going to be. The size of the sheets are perfect for what you need to do. The value is on point for the quality. It does not rip very easily but you can cut it to size without any problems. Again, This is a must buy for anyone who is pushing 1000w rms or more.
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Reviewed in the United States on November 29, 2025
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