Well you are 100% wrong it was the exact plug for the application. There was no preignition happening, the plug failed and this is not the only time I have seen this. I have been working on cars for over 20 years and have never seen this where a plug simply falls apart. But since this happend I have researched it and have found many reports of this happening. This is why I wont use Bosch plugs any more, if they can't build a plug that does not fall apart then I won't use them. Once again when I took the head off there was no sign of preignition the plug simply failed.
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