The iconic hood scoop that Subaru features on all WRX models actually serves a performance purpose. The intercooler for the turbocharged engine sits on top of the motor just below the hood, and the open hood scoop feeds air directly into it. This cools down the intercooler which reduces the temperature of the air entering the combustion chamber. Cooler air means more oxygen and thus more power, and it also prevents engine detonation and pre-ignition from occurring.