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NGK TR55 or NGK TR55IX Spark Plugs

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Old 03-13-2010, 10:15 AM
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Default NGK TR55 or NGK TR55IX Spark Plugs
Why do more people run the cheaper plug over the Iridium plug? Is the Iridium plug not a better product that will last much longer?
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Old 03-13-2010, 12:46 PM
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The Iridiums are great, I fouled out three while tuning and they covered them under warranty.

Designed to last 100,000 miles. The regular 55's are good to and cost less.
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Old 03-13-2010, 07:20 PM
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I think people run the regular ones b/c $1.50 vs. $11 a plug.
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