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nothing but NGK's here. Best plugs I have ever used. Personally I dont think platinums are worth it. Platinum plugs last longer but platinum is not as good as conductor as copper. Theoretically copper should produce a stronger spark. In the real world I am not sure if it really makes a difference. I change my plugs way too often to use the advantages of platinums. As far as Iridium plugs goes I dont have any experience with those. I have heard they are good plugs for nitrous and boost. Other than that they are pretty much a waste of money for NA applications, or so I am told.
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