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Straight NGK Coppers or V-Powers. Only thing to use for performance. Change them every other oil change. For $1.9x each it's not too big a hit in the wallet. The Iridiums are ok for longevity, but they have the problem that under high heat and pressure conditions, the tiny electrode tends to glow, and stay glowing resulting in dieseling or pre-ignition. I use the straight coppers in everything, and love them.
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