NGK R6725-105 3857 Spark Plug Racing R6725105

The NGK R6725-105 3857 Racing Spark Plug is engineered for maximum ignition efficiency in demanding racing engines. With a 14mm thread and rugged construction, it delivers a strong, consistent spark, exceptional durability, and reliable performance under high RPM and extreme heat. Its precision electrode design promotes efficient fuel burn and responsive throttle, while withstanding vibration and harsh conditions common on track days. Ideal for performance builds requiring proven NGK reliability and optimized ignition characteristics.