NGK R2558E-10 / 97278 Spark Plug Racing

The NGK R2558E-10 / 97278 Racing Spark Plug is engineered for high-performance engines demanding precision and durability. With NGK’s long-standing expertise in spark plug technology dating back to the 1930s, this 12mm diameter plug delivers consistent ignition, improved flame front propagation, and reliable cold or hot-start performance across race and high-load applications. Built to meet stringent manufacturer specifications, it combines robust insulator design, premium electrode materials, and tight tolerances to minimize misfire risk under demanding conditions. Whether used in tuned street machines or competitive race setups, the R2558E-10 is designed to maximize horsepower, throttle response, and overall engine efficiency while maintaining NGK’s reputation as a world leader in spark plug technology.