$700 to replace spark plug

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Remember plugs are out there that are fake counterfeits to oem. They are near identical to the real thing and have the same marking and packaging as originals. Only an expert can tell the difference. Often sold on Amazon or other. On line and also can make their way into other suppliers inventory. If I were a shop I’d be reluctant to use plugs from an unknown source. If the come apart they can ruin an engine. So I would say don’t do this and a low price isn’t always the lowest cost.