Cutting open a spark plug? No way.

Interesting about the disassemble-able plugs. I thought the porcelain and metal parts had to form a hermetic seal.

It might be possible to cut through the ceramic by water jet. I know that ferrites (another ceramic) can be water jet machined. I would think that any saw would chip the porcelain.
 
Water jet can cut just about anything, but if you go careful a diamond saw should work just fine and is a lot more accessible.

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