These Autolite XP Xtreme Performance spark plugs feature an iridium-enhanced .6mm fine-wire center electrode design and patented platinum side wire technology. They will provide better overall durability and a more focused ignition to produce higher ignitability and improved performance. The Autolite XP Xtreme Performance spark plugs use a nickel plated shell and multi-rib insulator. Whether you have a high performance street car, race car, or daily driver, these Autolite XP Xtreme Performance spark plugs will give you the power and consistency that you have been looking for.

Brand: Fram Manufacturer's Part Number: XS4164 Part Type: Spark Plugs Product Line: Autolite XP Xtreme Performance Spark Plugs Shorty Spark Plug: No Resistor: Yes Manufacturer Heat Range: 4 Electrode Core Material: Copper Electrode Tip Material: Nickel alloy Insulator Type: Projected Spark Plug Thread Size: 12mm Spark Plug Reach: 0.750 in. Spark Plug Seat Style: Gasket Wrench Diameter: 11/16 in. Ground Strap Quantity: One