Thread: Spark plugs
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Old 06-17-2010, 01:08 PM   #2 (permalink)
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The Crimson Crawler - '04 Hyundai Elantra GLS
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Platinum +4's are kind of a waste. The +2's made noticeable effect in my '97 Escort though. I'd say if your plugs are that bad, new ones will probably bring a 5-7% increase.
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