LOL@Charles

No its not needed on NA cars and actually would hinder performance. First of all an intercooler is just a heat exchanger much like a radiator. However its used to cool very hot air when it is compressed (compressed air rises in temperature very quickly). Compressed air=Turbo Charger or Supercharger. On an NA engine the air isnt compressed before it enters the combustion chamber.

Basically the air going through your engine via intake filter wont get any cooler with an interfooler or not significant enough to matter. With a turbo that air is MUCH HOTTER so the intercooler is needed