Injen has recently released their Evolution Air Intake System for the 2015-16 Subaru WRX/STI that will replace the factory airbox and intake tube. The Injen Evolution Air Intake includes an air scoop and will reuse the existing MAF sensor and hoses to ensure a proper fit and no check engine lights.
This intake features a supernano web dry filter and massive horsepower and torque gains. During testing at Injen, this intake resulted in a +26 hp and +35.5 ft/lbs of torque gain. The enclosed airbox design offers a clean look and superior heat protection compared to traditional open element systems.