Focus Fanatics - View Single Post - Denso Iridium plugs. Yay or nay?
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Old 09-23-2012, 09:54 AM   #3
zetecDon
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Either stick with what the manufactor recommends or going with the Motorcraft or Autolite copper plugs. Other than that, you aren't going to see any significant increase using those plugs.
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