AEM Cold Air Intake System | 2006-2007 Subaru WRX and 2006 Subaru WRX STI (21-477C)2006 2007 Subaru WRX and 2006 Subaru WRX STI Cold Air Intake System by AEM The AEM 21 477C Performance Cold Air Intake System produces horsepower and torque gains by replacing your vehicle's restrictive factory air filter and air intake housing. This air intake system was designed, tuned and dyno tested to fit specific Subaru Impreza WRX WRX STI, Forester Turbo and SAAB 9 2X models. Air enters the system through an oversized AEM Dryflow synthetic
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AEM Cold Air Intake System | 2006-2007 Subaru WRX and 2006 Subaru WRX STI (21-477C)