Taurus Car Club of America : Ford Taurus Forum - View Single Post - Good cheap, DIY upgrades under the hood?
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post #21 of (permalink) Old 11-10-2011, 06:32 PM
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Hi ericf, actually the iridium can increase horsepower. importtuner.com did dyno tests on some different plugs and posted their results here. Fact Or Fiction - Sparkplug Horsepower - Import tuner Magazine
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