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does anyone know for sure if Iridium spark plug is more powerful or if Copper spark plug is more powerful for a GS400. Different car work better with different kind of spark plug, so i was just wondering which would be more powerful, Iridium or Copper, thank you.

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does anyone know for sure if Iridium spark plug is more powerful or  if Copper spark plug is more powerful for a GS400. Different car work better with different kind of spark plug, so i was just wondering which would be more powerful, Iridium or Copper, thank you.

Dealer says use iridium in the 400 and platinum in the 300.

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does anyone know for sure if Iridium spark plug is more powerful or  if Copper spark plug is more powerful for a GS400. Different car work better with different kind of spark plug, so i was just wondering which would be more powerful, Iridium or Copper, thank you.

Dealer says use iridium in the 400 and platinum in the 300.

thankz for info. :)

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