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Iridiums are probably sub-contractor made which NGK then labels.
An interesting factoid about Porsche plugs is that they are same as regular Bosch/Beru except for one thing. They come with a three digit code from which the date can be determined. So a guy could see by date look up if at a previous vehicle service and last plug change was due, if they were indeed changed.
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Jeff
74 911, #3
I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible.
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