NGK 6289, Number 4 Spark Plug, 1 Unit

Designed specifically for performance enthusiasts, the Iridium IX offers extreme inflammation, improved throttle response, and superior anti-fouling. The fine 0.6 mm laser-welded iridium tip ensures high durability and a constant spark, and the conical earth electrode minimizes the electric tempering effect. Longer insulating nose prevents fouling, the wrinkled, corrugated (BS) on insulation prevents flashover, and a triple seal eliminates flashover gas leaks. Iridium alloy has an extremely high melting point, giving it great durability to heat and electrical wear, perfect for today's high-performance engines. Trivalent metal plating offers superior anti-corrosion and anti-seizing properties.