IFR6T11 SPARK PLUG LASER IRIDIUM POWER 4589 delivers unmatched ignition performance for TOYOTA engines. Precision-crafted with laser-welded iridium center electrode for extreme durability and consistent spark. Ultra-fine 0.6mm tip ensures faster flame kernel growth and improved fuel efficiency. Triple gasket sealing prevents gas leakage under high-pressure conditions. Ideal for high-performance vehicles, urban commuting, and long-distance driving. OE-specified heat range (4589) maintains optimal thermal characteristics. Platinum side electrode resists wear and carbon buildup. Direct OEM replacement with perfect fitment for smoother starts and reduced emissions.