Intercooler Piping Kit RB20/RB25 Nissan SkylineNissan Rb20det Rb25det Front Mount Intercooler Kit Direct Bolt on An intercooler is primarily used to cool the compressed air from a turbo, below is why that's important, 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 centimeter of air entering your engine, The intercoolers job is to cool the compressed air down, this