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Every car is different. Some drive without tune, DP and cel on. Others with tune, DP and stock plugs and others do it all "as recommended". Most people find out if they need spark plugs after some hard pulls. Also depends on how aggressive the tune is. I went with replacing my spark plugs with 2 step colder and gapped to 20" and haven't had a hiccup. Also ran a stage one with stock plugs and never had a hiccup either.
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