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Registered
Join Date: Apr 2002
Location: Houston (Clearlake), TX
Posts: 11,334
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I use iridium plugs in my kart and think they do make a difference, but I couldn't justify the cost for 12 of them. I saw a test where the platinum plugs didn't work as well as the copper plugs for the first few miles but in the long run the platinum did much better.
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2014 Cayman S (track rat w/GT4 suspension)
1979 930 (475 rwhp at 0.95 bar)
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