Let's not confuse platinum and iridium, completely different elements. Iridium plugs seem to fire better in more turbulent conditions such as a turbocharged engine (I'm not sure exactly why, though, with their chemical configuration it doesn't make sense to me). I would not expect to see that big of a difference on a N/A motor, and they're a long life plug as well. Platinum can fire with less voltage but aren't considered to be as hot of a spark, although platinum plugs are copper on the inside if you cut them open, platinum lasts alot longer than copper, which makes them perfect for OEM's.
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