The best replacement for ngk is denso.

The best alternatives to ngk are rated as following:
★★★★★  denso
★★★★  champion
★★★  bosch
★★★  autolite
★★  denso spark plugs
★★  denso iridium
★★  ac delco
★  e3
★  denso plugs
★  bosch spark plug
★  bosch plugs
★  motorcraft spark plugs
★  autolite spark plugs
★  ntk
★  bosch spark plugs
★  msd wires
  champion spark plugs
  bosch wires
  champion plugs
  ngk r
  bosch spark plug wires
  denso iridium spark plugs
  iridium
  beru
  motorcraft
  magnecor
  ac delco plugs
  denso better
  nippondenso
  ac delco iridium
  ac delco spark plugs
  splitfire

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Google Trends

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