Intercooler 450x230x65 2.5" Inlet/OutletFront Mount Intercooler 450x230x65 with 2. 5" inlet and outlet pipes. An intercooler is primarily used to cool the compressed air from a turbo. The heat from the exhaust side of the turbo heats the intake side and compressing the air heats it further. Hot air is less dense and as such will have less oxygen for every square centimetre of air entering your engine. The intercoolers job is to cool the compressed air down, this makes the air denser and