NGK Racing Spark Plug (R2558E-9)

This box contains four NGK R2558E-9 racing spark plugs, designed to handle the demands of serious performance driving and racing conditions. These plugs feature a special center electrode configuration built for durability and reliable ignition, even under the harshest engine loads. They bring ultra-high performance across a variety of heat ranges, making them suitable for many racing applications.

The design includes a pure alumina silicate ceramic insulator that offers superior strength and improved heat transfer. Special insulator nose configurations are incorporated to help improve throttle response, while corrugated ribs on the insulator body prevent flashover. A copper core is included to aid in heat removal, and triple seals are used to prevent leakage, ensuring they perform reliably when you need them most.