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Nothing wrong with NGK as a brand, as they are the largest spark plug manufacturer to OEMs in the world. Had those in my Volkswagens and had no issues. That said, I used Beru plugs when I replaced mine in the '04 just recently (and turns out that's what was already in there).
Sounds like it was an eventual fault in that particular plug that allowed the electrode to separate.
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-Chris
2004 Porsche Boxster 2.7 (gone  )
2004 Porsche 911 C4S Cab
1991 Porsche 911 C2 Targa 3.6
2017 Subaru Outback 3.6R
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