This is an OEM replacement for my 2006 Mx5. Three of the four plugs were correctly removed from the box, one was a hair's breadth. After putting them all in correctly, it took me 20 minutes to change the spark plugs. My idle settled down and the throttle was more responsive. The engine feels like new. Revain also took slightly less than the dealer wanted. I don't think I could ask for more from a spark plug.
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