Thread: Denso Iridium plugs. Yay or nay?
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Old 09-23-2012, 03:01 PM   #5
iminhell
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Join Date: Jun 2006
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What I Drive: 2000 & 2001 ZX3's

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The coppers (SP-463) is a colder plug.

I've no clue on MPG loss or gain.
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