I've read lots of info and people say just use standard copper plugs on turbo setups. The extra heat destroys them quicker, or something along those lines.
The quality is the same. NGK make good gear, but IMO your application doesn't need iridium. Even a high end NA car would probably be better off running copper plugs over iridium.
You should go one heat range colder then standard plugs. I think you're one heat range higher then stock at the moment.
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