⚡ Ignite your engine’s full potential with Autolite Racing Spark Plugs!
Autolite AR3910X Racing Spark Plugs feature a yttrium-enhanced alloy that reduces side wire temperature by 8% for improved durability and less pre-ignition. Their cut-back ground electrode design promotes faster flame kernel growth, ensuring quicker ignition. Nickel plating provides corrosion resistance, while vehicle-specific fit guarantees optimal performance. Trusted by professional racers and backed by over a century of expertise, these plugs deliver high-performance reliability for modified and stock engines alike.
| ASIN | B00IAAVU56 |
| Automotive Fit Type | Vehicle Specific Fit |
| Best Sellers Rank | #492,286 in Automotive ( See Top 100 in Automotive ) #2,681 in Automotive Replacement Spark Plugs |
| Brand Name | Autolite Iridium Ultra |
| Compatible with Vehicle Type | Car |
| Core Material | Nickel |
| Customer Reviews | 4.7 4.7 out of 5 stars (649) |
| Global Trade Identification Number | 00009100031105 |
| Included Components | High Performance Racing Non-Resistor Spark Plug |
| Item Highlight | Replaces 41R91 7405. Copper-core build with specialized heat ranges for high-RPM, high-compression competition engines. |
| Item Type Name | Racing Non-Resistor Spark Plug |
| Item Weight | 1.92 ounces |
| Manufacturer | FRAM |
| Manufacturer Part Number | AR3910X-4PK |
| Manufacturer Warranty Description | Lifetime Limited Warranty |
| Model Number | AR3910X-4PK |
| Number of Items | 4 |
| OEM Equivalent Part Number | AR3910X-4PK |
| Thread Size | 14mm X 1.25 |
| Top Material Type | Alloy Steel |
| UPC | 009100031105 |
| Unit Count | 4 Count |
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