Those running Denso Irridiums
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Depends on your mods on whether its critical to get them. Near stock I wouldn't bother. When I went from 2#-4# pulley the added compression caused the stock plugs to miss badly up in the RPM range. Actually slowed my 1/4 mile times. Switched to the Densos and the miss went away and 1/4 mile times returned.
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