






⚡ Ignite your engine’s true potential with pro-grade spark plugs!
The Autolite AR3923-4PK High Performance Racing Resistor Spark Plug pack features a colder heat range and yttrium-enhanced alloy that reduces side wire temperature by 8%, improving durability and preventing pre-ignition. Its cut back ground electrode enhances ignition efficiency, while anti-corrosive nickel plating protects against rust. Designed for vehicle-specific fitment, these plugs are the choice of professional racers seeking reliable, high-performance ignition.





| Manufacturer | Autolite |
| Brand | Autolite Iridium Ultra |
| Model | AR3923-4PK |
| Product Dimensions | 2.54 x 2.54 x 8.59 cm; 45.36 g |
| Item model number | AR3923-4PK |
| Exterior | Chrome |
| Manufacturer Part Number | AR3923-4PK |
| Position | Front, Rear |
| Item Weight | 45.4 g |
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