NGK Iridium IX Spark Plug Box of 4 (ZFR6AIX-11S)

NGK Iridium IX Spark Plug Box of 4 (ZFR6AIX-11S)

Marsoni

M251S

$46.52

Get it in 3 business days with 1 day shipping. Friday, May 29

NGK Iridium IX Spark Plug Box of 4 (ZFR6AIX-11S)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

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decent product. not as thick as typical sound deadening but definitely cheaper. and for my application, i didnt need a name brand thicker material. i am putting it on our heat and ac vent and intake pipes during our remodel. sound travels from room to room in our old house through these vents and pipes so a little sound deadening goes a long way

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Reviewed in the United States on June 2, 2026