Inter cooler
 

What dose a inter cooler do?. What is it used for?.
I know that might sound like stuiped thing to ask. But I have no idea what so ever what an inter cooler is used for let along do..

When air is compressed via a supercharger or turbo, it heats up. Intercoolers cool the air down, to prevent detonation and make more power.

like he said. Its like a radiator, except instead of moving air cooling the antifreeze, it cools the compressed air, which is hot. You can get more air in a box if its cold than if its hot. More air = more fuel= more HP