• Laser Iridium spark plugs, stock heat range, box of 4
• Iridium-tipped center electrode, 6x harder than platinum
• High-grade pure alumina ceramic insulator
• 98% pure copper core prevents heat-related misfires

OE-Engineered, Not Just OE-Compatible

NGK Laser Iridium spark plugs offer the best combination of performance and longevity, engineered specifically for OE applications and tested to the highest standards to ensure quality and durability. The iridium-tipped center electrode provides durability six times harder than platinum, meaning these plugs hold their precise gap and firing characteristics far longer than a standard copper or even platinum plug. That durability directly translates into more consistent ignition over a much longer service interval. That's the kind of detail that separates genuine engineering from a basic replacement part.

Built to Prevent Heat-Related Misfires

NGK's high-grade pure alumina ceramic insulator combined with a 98 percent pure copper core helps prevent the heat-related misfires that can plague a lesser plug under sustained hard driving or boost. This stock heat range version is matched specifically to factory-spec engine operating temperatures, making it the correct choice for a stock or mildly modified engine rather than one running significantly more boost or compression. It's a genuine OE-grade replacement plug, not a generic aftermarket equivalent. It's a small distinction that makes a real difference once you're actually using it.

Straight From Subispeed

A genuine OE-grade spark plug upgrade for 2019-2020 STI — iridium durability with a heat range matched to stock engine operation.

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