Autolite AR3923-4PK High Performance Racing Resistor Spark Plug, Pack of 4

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