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This DENSO IU01-24 is a premium racing spark plug featuring an iridium center electrode. Iridium offers superior durability and a lower required voltage, leading to a hotter spark and more efficient combustion. Engineered for demanding racing conditions, this spark plug provides enhanced ignition performance and reliability. Its advanced design helps to prevent fouling and ensures consistent performance under high stress. Upgrade your vehicle's ignition system with this top-tier spark plug for improved throttle response and power delivery. It is built to withstand extreme temperatures and pressures found in motorsport.