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IN search I am understanding that compared to ngk #6, the hks are no good unless you use a twin power. Heres my question, If without a twin power, ngk's are better than hks , why wouldn't ngk's with a twin power not be better than hks with a twin power? Ive had a twin power for a while and have ngk #6 for a long while(Its about time to get new plugs and am decidng on which to get)
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