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.. Acura CSX 2011-2006, MDX 2009-2007, RL 2008-2005, RSX 2006-2002, TL 2008-2004, TSX 2008-2004, Honda Accord 2007-2003, Civic 2011-2002, CR-V 2009-2002, Element 2011-2003, Fit 2014-2007. NGK Iridium IX spark plugs are specifically designed for the performance enthusiast. Iridium IX provides outstanding acceleration, high fuel efficiency and durability.. RECOMMENDED USAGE: Modified or high performance applications, or as an upgrade to OE nickel alloy spark plugs. NGK Iridium IX Spark Plug Box of 4 (ZFR6AIX-11S). NGK Iridium IX Spark Plug. Iridium IX Spark Plug. Spark Plug

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