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Go ahead and replace them, this way you can waste your time and money trying to figure out why it runs like crap with new plugs.
High Performace plugs are B/S. You wont find a better performing spark plug for a stock engine than whats in it. Unless your boosted or using squeeze dont waste your time and money.
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URR2SLO - If you're not going fast enough, get out the way......
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