K&N 18-19 Subaru WRX 2.0L Turbo Typhoon Air IntakeThe K&N Typhoon air intake system is a free flowing, mandrel bent aluminum tube air induction system. The restrictive factory air filter and air intake housing are replaced by the K&N Typhoon air intake which is designed to dramatically reduce air flow restriction as it smoothes and straightens air flow. This allows your engine to inhale a larger amount of air than the factory air intake. More air means more usable power and acceleration throughout