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Denso 5344 Spark Plug, Spark Plugs - Canada. Denso 5344 Spark Plug in Spark Plugs.. IKH20 。 Iridium Spark Plug 's Iridium power spark plugs help your vehicle achieve unparalleled performance. It alters the belief that a mere spark plug can add power and mileage. This is done by combining an ultra-fine 0.4mm diameter Iridium center electrode with a tapered cut U-groove ground electrode. Iridium conducts electricity better than platinum, however what makes it exceptional is it's also 6x harder and 8x stronger than platinum. Because of this, the center electrode can be machined down to 0.4mm. This ultra-fine iridium center electrode provides superior ignition performance during acceleration and top cruising RPM. The U-groove ground electrode creates a larger, brighter flame kernel. The tip of the ground electrode has been tapered which further improves firing performance by reducing quenching. All of these features combine to give more horsepower to your motor. Technical Specifications - 14mm Thread, 26.5mm (1.04-Inch) Reach, 5/8-Inch (16mm) Hex Size, Gasket Seat, Resistor, Removable Terminal, ISO height, 0.4mm Iridium Center Electrode, Tapered Cut U-groove Ground Electrode, .044-Inch (1.1mm) Gap. 。 。 。