NGK R6601-10 4017 Spark Plug Racing R660110

The NGK R6601-10 4017 Racing Spark Plug delivers uncompromising ignition performance for high-demand engines. Designed with a 14mm diameter and a precision-finished electrode, these plugs provide a stable, hot-capable spark under race conditions, improving throttle response and power delivery. Built with NGK’s renowned durability, they resist fouling and wear, offering reliable starts and consistent performance across wide RPM ranges. Ideal for competition, performance-tocused street cars, and tuned engines, the R6601-10 features a carefully engineered heat range to balance fast heat-up with resistance to pre-ignition, ensuring repeatable results lap after lap. Easy to install and compatible with a variety of high-performance ignition systems, they’re a trusted upgrade for drivers seeking peak reliability and top-end power from their 14mm plug application.