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Drawbacks? They cost a little bit more than copper plugs.
I ran those same plugs for about 50k km's on a stage 2 2.7T, and they were still going strong when I pulled them out.
I've seen the best performance and longevity on the Bosch Platin sidefires, then the NGK Iridium, then NGK Platinum BKR6EGP. I only use the Bosch sidefires in my own cars as well as customers' cars these days, the things last forever.
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