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The NGK Iridium IX UR5IX is a performance-oriented spark plug with a fine-wire iridium center electrode and a tapered cut ground electrode. NGK says the iridium tip is six times harder than platinum and resists fouling, which supports easier starting, steadier idle and sharper throttle response. It suits enthusiasts and tuners replacing plugs on modified or high-mileage engines. Against platinum plugs it trades a higher purchase cost for longer service life and stronger ignitability; NGK's own Ruthenium HX line sits above it for the most demanding setups.
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NGK Iridium IX spark plugs are designed for performance enthusiasts. This box contains 4 plugs, model UR5IX. They are built for acceleration, fuel efficiency and durability, with strong ignitability and resistance to fouling.
The center electrode is made of fine-wire iridium alloy. The material is six times harder than platinum and has a very high melting point. The ground electrode has a tapered cut, which improves starting, idling and throttle response.
