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I did see an earlier thread on spark plugs but I really didn't see any members chimming in from California, where our average top grade gas is only 91 octane. I am scheduled for my s/c + Stealth tune at the end of the month. If a spark plug change is needed I would prefer to get it done while there doing the s/c install. So any recomendations on which plug would be best for this California driver?
-Sean
 

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I've loved my TR-7IX Iridium plugs myself when I was spraying a 250 shot on my 2001 Z28. Those would be great too.
 
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