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