NGK spark plugs are great for high performance applications. These 1 Heat Range Lower plugs and feature a traditional style end for easy gapping. NGK suggests these plugs be used for slightly modified or mild boost applications. This is an ideal plug for nitrous, turbo, and supercharger applications.

These NGK Iridium IX spark plugs feature an ultra-fine center electrode that's designed just thick enough to ensure the maximum durability and life of the spark plugs, and just thin enough to create an accurate and consistent spark.