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they get more horsepower with oil changes or anything they are paid to hawk...sad IMO...I think good plugs...and there are many out there...will be an improvement only if you need new plugs...I have used the stockers as well as A/C Delco RapidFire Platinums with success...I have never heard anyone say a bad think about the NGKs in whatever version from the 'Vette folks, F-Body people or our GTO crowd...I also have had Nippondenso (Denso) Platinums with no ill effects...
Bill
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Like what you've got?...Thank a Vet!
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