While my personal opinion is that copper core wires edge the platinums a bit in performance, you can't beat the longevity of many of the platinum plugs...(Bosch is one of them)
If you don't feel like changing your plugs out at relatively shorter intervals, the +4s may be a good purchase for you...
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98 GT
Dyno-Max cat-back exhaust, 3.73 gears, Steeda shifter, Ford Motorsport Underdrive pullies, 87mm MAF and Roush cold air kit...
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