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I used coppers and they suck imo. They are good for about a few thousand miles before starting to break up and needing to be replaced. Now I run the iridium 7's (2 steps colder) pregapped at like .28 or something (was for a Polaris or something IIRC) for my distributor KA turbo and it's perfect. No break up under 16 psi of boost and I consistently get a combined city/hwy 25mpg. If you have coilpacks then you can use the standard model that comes pregapped at .35-.36.
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