I beg to differ. My 2009 2.3 Manual, purchased new, had NGKs from the factory until today. Yes, this was a surprise to me when I read it somewhere years ago and confirmed at the 90,000 mile inspection.
Changed out with 247,xxx miles on plugs. Plugs were rotated at 90,000 miles to even out...
See if you can find plugs like the ones in mine, maybe ford dealer or junkyard. They are molded so they maintain the contour of the air intake tube when installed rather than being a flat plug on the inside.
I believe they're there to help silence the intake. Their volume is tuned and will help cancel out harmonics at certain engine RPMs. My 2009 does not have them; instead it has plugs in the air intake tube where they would go.
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