NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability. NGK Iridium IX plugs offer extreme ignitability and exceptional anti-fouling. Tapered cut ground electrode provides improved starting, idling and throttle response. The Iridium fine wire center electrode's durability is six times harder than platinum. Iridium alloy's extremely high melting point is perfect for today's engines. For even greater performance consider upgrading to an NGK Ruthenium HX plug.. The improved throttle response, superior anti-fouling and high-ignitability makes Iridium IX® the ideal choice for any performance enthusiast. Iridium's high melting point is perfectly suited to today's high-temperature engines, delivering outstanding acceleration, fuel efficiency and durability.. NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability.. ACURA CSX 2010-07, INTEGRA 2001; HONDA CIVIC 2011-10; SAAB 9-5 2003-99, M/C - 2007-2000 HONDA, O/B - 2001-2000 YAMAHA. RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs. Trivalent metal plating for superior anti-corrosion and anti-seizing properties. Outstanding acceleration, high fuel efficiency and durability. Fine iridium tip ensures durable and consistent spark. NGK Iridium Spark Plugs Box of 4 (BKR7EIX-11). NGK Iridium IX Spark Plug. Iridium IX Spark Plug. Spark Plug

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