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Hello
Maybe we have to enroll the history from spark plugs and why Porsche always had to push that technology as noone would have accept to use warm up spark plugs.....
The first 4 electrode spark plugs standard in aotomotive use where the Golden Lodge ( Alfa GTA´s ). In the same time Porsche changed over to use the Silberelectrode Boschs or the first Platin spark plugs ( Champion N2 G ) to catch the same problem.
The split electrode design is used in some BMW Engines since the mid 70´s and can be bought from NGK.
Today the sprk system is more optimized to fail safety ( catalyt ) and lonlivety for longer maintance.
I think the Subaru SVX is still the lowest maintance engine with a 60 000 mls intervall. And you can change them faster then in a 964/993.
Grüsse
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