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I don't think you can blame the MP tune for a spark plug cracking and falling into the engine.
That's either:
1) Defective plug out of the box.
2) Mechanic dropped the plug and cracked the ceramic, and then installed it.
3) Mechanic broken the tip while trying to gap it.
The aluminum pistons / block is melting far before the ceramics do, and you are mixing together multiple red herrings blaming the wrong source.
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