Grimmspeed Top Mount Intercooler BLACK - Subaru WRX 01-07/STi 01+/Forester XT 03-08Product Description So, you probably already know that you want an intercooler with maximum cooling and minimum restriction, but when it comes to selecting the right man for the job, we think its important to understand why. As air is pressurized by your turbo, it heats up, not because of the heat of the turbocharger, but because when theyre compressed, the atoms in the air are forced closer together and as a result, move faster and have more energy.