Neil,
They are a waste of money, just a gimmick to sell overpriced plugs. Stock Champions are still the best choice for the 488. Look up the threads here, search under the keyword splitfire.
"DO NOT USE THEM, THEY CAN RUIN AN ENGINE!!!!!!!!!!!!!!!"
I think if you put the white end on the outside they will be ok. They might not add any performance but care in installation will reduce engine damage.
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