The best replacement for naturally aspirated is turbo.

The best alternatives to naturally aspirated are rated as following:
★★★★★  turbo
★★★  supercharged
★★  fuel injected
★  forced induction
★  direct injection
★  twin turbo
★  turbo diesel
  normally aspirated
  turbocharged
  turbo charged
  supercharger
  force induction

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Google Trends

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naturally aspirated
turbo
supercharged