---
product_id: 214894231
title: "Autolite AR3923-4PK High Performance Racing Resistor Spark Plug, Pack of 4"
brand: "autolite iridium ultra"
price: "$40.11"
currency: USD
in_stock: true
reviews_count: 6
category: "Autolite Iridium Ultra"
url: https://www.desertcart.us/products/214894231-autolite-ar3923-4pk-high-performance-racing-resistor-spark-plug-pack
store_origin: US
region: United States of America
---

# 8% cooler side wire temp colder heat range for mods nickel anti-corrosive plating Autolite AR3923-4PK High Performance Racing Resistor Spark Plug, Pack of 4

**Brand:** autolite iridium ultra
**Price:** $40.11
**Availability:** ✅ In Stock

## Summary

> ⚡ Ignite your engine’s true potential with Autolite Racing Spark Plugs!

## Quick Answers

- **What is this?** Autolite AR3923-4PK High Performance Racing Resistor Spark Plug, Pack of 4 by autolite iridium ultra
- **How much does it cost?** $40.11 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.us](https://www.desertcart.us/products/214894231-autolite-ar3923-4pk-high-performance-racing-resistor-spark-plug-pack)

## Best For

- autolite iridium ultra enthusiasts

## Why This Product

- Trusted autolite iridium ultra brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Heat-Resistant Alloy:** Yttrium-enhanced alloy reduces side wire temperature by 8%, minimizing pre-ignition risks.
- • **Race-Proven Durability:** Trusted by professional drivers for peak performance under extreme conditions.
- • **Corrosion-Resistant Finish:** Nickel plating ensures long-lasting protection against rust and wear.
- • **Optimized Ignition Efficiency:** Cut-back ground electrode enhances flame kernel ignitability for faster, cleaner combustion.
- • **Precision Fit for Performance:** Vehicle-specific design guarantees seamless installation and optimal engine compatibility.

## Overview

Autolite AR3923-4PK High Performance Racing Spark Plugs deliver professional-grade ignition with a colder heat range and yttrium-enhanced alloy that cuts side wire temperature by 8%, boosting durability and reducing pre-ignition. Featuring a cut-back ground electrode for superior flame kernel ignitability and nickel plating for corrosion resistance, these plugs are engineered for modified engines and trusted by race drivers worldwide.

## Description

Autolite Racing Spark Plugs are used by many professional race car drivers. These spark plugs contain an Yttrium-Enhanced Alloy, which enables up to 8 percent reduction in side wire temperature for improved durability and less pre-ignition. Autolite racing plugs are available in colder heat ranges than most plug manufacturers to support modified engines and feature a cut background electrode for improved ignitibility and faster flame kernel growth. They are also nickel plated for a long-lasting, corrosion-resistant finish. Since its inception, the Autolite brand has provided the automotive aftermarket and Original Equipment manufacturers the highest quality ignition products. Autolite has been in operation for over 100 years and has produced more than 11 billion spark plugs and glow plugs. These plugs are specifically designed for each application to meet or exceed OE quality and performance. Autolite makes plugs for Japanese, European, and Korean cars as well as plugs for Lawn & Garden and Power Sports. As a leading supplier of spark plugs, the Autolite brand has the right ignition products for your application, regardless of make or model, import or domestic.

Review: great spark plugs - we put the plugs in the race truck every year great plugs
Review: Preferred plug for SBF w AFR185s & 100 shot - Recommended by AFR, run them with no issues on NX 100 shot gapped at .035. The cut back ground strap and nickel plating are nice. The nickel plating with just a little anti seize makes removal a non-issue from aluminum cylinder heads. Recommend grabbing them when the price is right, sometimes it’s same or better than the standard 392X Autolites.

## Features

- Replacement racing spark plug used by many professional car drivers
- Specifically designed with colder heat ranges than the factory plug to enable performance modifications and handle intense conditions
- Contains an Yttrium-enhanced alloy to enable up to 8% reduction in side wire temperature for improved durability and less pre-ignition
- Features cut back ground electrode for improved ignitability of flame kernel
- Coated in an anti-corrosive nickel plating to prevent rusting
- Fit type: Vehicle Specific

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B000CBQ6D2 |
| Best Sellers Rank | #182,099 in Automotive ( See Top 100 in Automotive ) #1,112 in Automotive Replacement Spark Plugs |
| Brand | Autolite Iridium Ultra |
| Brand Name | Autolite Iridium Ultra |
| Compatible with Vehicle Type | Car |
| Core Material | Nickel |
| Customer Reviews | 4.4 out of 5 stars 62 Reviews |
| Global Trade Identification Number | 00009100026576 |
| Included Components | 4 spark plugs |
| Item Height | 3.38 inches |
| Item Type Name | HP Racing Spark Plug |
| Item Weight | 0.1 Pounds |
| Manufacturer | Autolite |
| Manufacturer Part Number | AR3923-4PK |
| Manufacturer Warranty Description | 4 Year Limited |
| Thread Size | 14mm |
| Top Material Type | Nickel |
| UPC | 009100026576 |
| Unit Count | 4.0 Count |
| Vehicle Service Type | Car |

## Product Details

- **Brand:** Autolite Iridium Ultra
- **Core Material:** Nickel
- **Thread Size:** 14mm
- **Top Material Type:** Nickel
- **Vehicle Service Type:** Car

## Images

![Autolite AR3923-4PK High Performance Racing Resistor Spark Plug, Pack of 4 - Image 1](https://m.media-amazon.com/images/I/71Bq-jTkqeL.jpg)

## Customer Reviews

### ⭐⭐⭐⭐⭐ great spark plugs
*by D***L on December 28, 2024*

we put the plugs in the race truck every year great plugs

### ⭐⭐⭐⭐⭐ Preferred plug for SBF w AFR185s & 100 shot
*by D***D on May 6, 2022*

Recommended by AFR, run them with no issues on NX 100 shot gapped at .035. The cut back ground strap and nickel plating are nice. The nickel plating with just a little anti seize makes removal a non-issue from aluminum cylinder heads. Recommend grabbing them when the price is right, sometimes it’s same or better than the standard 392X Autolites.

### ⭐⭐⭐⭐⭐ Five Stars
*by K***N on July 22, 2015*

AAA

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*Product available on Desertcart United States of America*
*Store origin: US*
*Last updated: 2026-02-27*