NGK R2525-10 5281 Spark Plug Racing R252510

The NGK R2525-10 5281 Racing Spark Plug delivers a focused performance upgrade for high-demand engines. With a 12mm thread diameter and racing-specific design, it delivers reliable ignition under demanding conditions, helping to maximize throttle response and power output. The R2525-10 features optimized electrode geometry and heat range tuned for sustained high RPM use, enhancing combustion efficiency while resisting fouling and pre-ignition. Constructed with durable materials and robust sealing, it tolerates demanding race environments and provides consistent performance from first start to finish. Ideal for tuned street machines and race applications, this spark plug pairs well with performance ignition systems to unlock improved fuel economy, smoother idle, and enhanced overall engine response. Compatibility spans a range of racing and performance setups seeking dependable, repeatable ignition.