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The NGK Iridium IX BKR5EIX-11 is a set of four iridium-tipped spark plugs for gasoline engines that take the 11 mm reach, 14 mm thread plug with a 5/8-inch hex. The fine-wire iridium center electrode and tapered cut ground electrode are built for strong ignitability, easy starting and resistance to fouling. They suit drivers of older Japanese and domestic cars and trucks who want a durable upgrade over standard copper or platinum plugs. Against platinum plugs, iridium lasts longer and holds its gap better; against NGK's own Ruthenium HX, the Iridium IX is the more established, widely cross-referenced choice.
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Owners of older Hondas, Acuras and other 1990s-2000s cars report smoother idle, quicker cold starts and steady running after swapping in these plugs. Most praise the build quality and the fact that they come pre-gapped. A few note the higher cost versus copper plugs and say gains are modest on a healthy engine.
The NGK Iridium IX spark plug (BKR5EIX-11) is built for performance enthusiasts. It is designed to deliver strong acceleration, high fuel efficiency and durability. It also offers high ignitability and strong anti-fouling.
The fine wire center electrode is made of iridium alloy, which is six times harder than platinum and has an extremely high melting point. The ground electrode has a tapered cut, which improves starting, idling and throttle response.
