SKU: 39668942803

Holley EFI Gen III HEMI Smart Coils

Sale price$337.48 Regular price$374.98
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Ships within 48 hours · Estimated delivery Aug 14 - Aug 19

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Description

Holley EFI Gen III HEMI Smart CoilsHOLLEY EFI GEN III HEMI SMART COILS Black, Single Coil Overview These Holley EFI Smart Coils are a bolt in ignition upgrade for your late model HEMI or Coyote engine. Here's the difference over a stock coil; they produce more spark energy while consuming less power without sacrificing voltage output. This means you get hotter spark at the plug to burn the maximum amount of fuel in each cylinder while using less power from your electrical system. For

HOLLEY EFI GEN III HEMI SMART COILS

Black, Single Coil

Overview
These Holley EFI Smart Coils are a bolt-in ignition upgrade for your late model HEMI or Coyote engine. Here's the difference over a stock coil; they produce more spark energy while consuming less power without sacrificing voltage output. This means you get hotter spark at the plug to burn the maximum amount of fuel in each cylinder while using less power from your electrical system. For Hemi combinations currently using Holley EFI or Terminator X, use Smart Coil Ignition Harnesses 558-312 Coil Extension Harnesses 558-326 for a plug and play solution.

Features:
  • Direct bolt-on to factory valve covers
  • Same wiring pinout as other IGN-1A coils for easy plugin upgrades (Will not work with factory wiring)
  • More spark energy than any other smart coil on the market for maximum fuel burn during combustion sequence
  • Low current draw means less demand on the electrical and charging system
  • Built-in ignitor for compatibility with Holley EFI and many other aftermarket ECU??????s
  • Maximum operating voltage of 18 volts ???? for compatibility with both 12 volt and 16 volt electrical systems found in many performance/race applications


Details:
  • Color: Black


Links
Instruction Sheet
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
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  • 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
SKU: 39668942803

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4.4 ★★★★★
Based on 18 reviews
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Verified Purchase
Lori Wornom
Natrona Heights, US
★★★★★ 4
Flatter than a regular pillow but nice and soft
Number of Items: 1
Is it softer than a typical memory foam pillow? Yes. But it’s also a lot flatter. I don’t find this pillow rebounds very well. It’s good for stomach sleepers but not so much for side sleepers. I’m a 2/3 of the night side sleeper so it’s unfortunately not my magic pillow.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 11, 2026
M
Verified Purchase
Matt
Waukegan, US
★★★★★ 5
Best pillow for my neck pain.
Number of Items: 1
I've tried so so many pillows to relieve my neck pain at night and this one is the first pillow that has actually worked. I was skeptical at first as this pillow is heavy and dense but one night and I was hooked. I couldn't believe I found a pillow that actually not only was comfortable but also relieved my neck strain. It's worth the cost to now be able to wake up without pain.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026
S
Verified Purchase
Sus from South Africa
Battle Creek, US
★★★★★ 5
Tempur-Cloud Pillow
Number of Items: 1
My daughter has been struggling to find a good pillow that does not hurt her ears. She is a tummy sleeper, as am I. I have also been struggling to find the perfect pillow. I heard about Tempur pillows and thought it a good idea to buy my daughter a pillow for her birthday. It arrived last night. She tried it out during the night. When she woke up this morning, the first thing she said was that the pillow is amazing. It was a good night for her. She said it felt like sleeping on a marshmallow - soft enough to not hurt her ears but firm enough to support her neck. The pillow is very comfortable. 😊
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 29, 2026
A
Verified Purchase
Agnieszka J.
Birmingham, US
★★★★★ 3
Just ok
Number of Items: 1
This pillow flattens so much I’m not sure if it’s a legit tempur pedic or not. I bought one previously from Tempur Pedic store and the quality is better plus is more supportive. This one is meh . I gave it to my husband, he doesn’t care
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Reviewed in the United States on April 13, 2026
G
Verified Purchase
gini stevenson
Houston, US
★★★★★ 5
Get one but use it on a medium firm mattress, not a firm one.
Number of Items: 1
You need a mattress that is medium firmness to use this wonderful pillow. It gives perfect neck support and I can sleep on all 4 sides with it. My neck/head pain quit first night used it. On a firm mattress it feels too hard and awkwardly cradle l es my head.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 24, 2026

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