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The Autolite AR3933X is a high-performance racing spark plug engineered with a colder heat range and a Yttrium-enhanced alloy that reduces side wire temperature by up to 8%, improving durability and minimizing pre-ignition. Featuring a cut background electrode for faster ignition and a corrosion-resistant nickel plating, it’s the trusted choice of professional drivers seeking reliable, race-ready ignition performance.

| Manufacturer | AUTOLITE |
| Brand | Autolite Iridium Ultra |
| Model | AR3933X-4PK |
| Product Dimensions | 12.7 x 2.54 x 2.54 cm; 54.43 g |
| Item model number | AR3933X-4PK |
| Manufacturer Part Number | AR3933X-4PK |
| Position | Center |
| Item Weight | 54.4 g |
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