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as the poster says, the smaller iridium tip creates a brighter spark, burning the fuel more efficiently, creating more power or better fuel economy, depending how you drive.
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I've used them for years without a single problem.
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There is a noticeable increase in responsiveness.
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thicker aftermarket leads will feed more power to the plugs.
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Don't be put off by people claiming magnacor leads are crap, the extra 3mm core gives even more throttle response.
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The holes around the fitting for the cap can get clogged with oil/dirt
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& pop off but that's not a problem if you're keeping the car tidy.
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The only other issue I've heard with them turned out to be the wrong leads
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(for an earlier model).
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Once again, I've used these for years without a problem.
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