Description

The AEM 21-478WR 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 WRX, WRX STI, Impreza WRX and Impreza WRX STI models. Air enters the system through an oversized AEM Dryflow synthetic washable air filter for outstanding air flow, filtration and performance. The air filter is located in the original air box space and is protected by a heat shield which is designed to reduce intake air temperature and increase horsepower. The intake tubing is constructed from mandrel-bent aluminum featuring a durable textured red powder coated finish. This air intake system was developed to accommodate the engine’s factory emissions control devices including the mass air flow sensor. The cylinder shaped AEM Dryflow air filter is made from an oil-free, synthetic filter media that can be used for up to 100,000 miles before cleaning is needed (depending on driving conditions). The air intake system is easy to install with commonly available tools and it is backed by AEM’s Lifetime Limited Warranty. Some AEM air intakes are not legal for sale or use in California and other states adopting California emission standards while others are 50 state legal. View the 21-478WR vehicle applications to determine the legal status for each vehicle.
AEM’s Performance Cold Air Intake Systems are designed, tuned and dyno-tested to give your engine more power and acceleration by replacing the restrictive factory air filter, air intake tubing and air box assembly.

Fitment:
SubaruImpreza2.5i2011
SubaruImpreza2.5i Premium2011
SubaruImprezaOutback Sport2011
SubaruImprezaWRX2008
SubaruImprezaWRX2009
SubaruImprezaWRX2010
SubaruImprezaWRX2011
SubaruImprezaWRX2012
SubaruImprezaWRX2013
SubaruImprezaWRX2014
SubaruImprezaWRX Limited2010
SubaruImprezaWRX Limited2011
SubaruImprezaWRX Limited2012
SubaruImprezaWRX Limited2013
SubaruImprezaWRX Limited2014
SubaruImprezaWRX Premium2009
SubaruImprezaWRX Premium2010
SubaruImprezaWRX Premium2011
SubaruImprezaWRX Premium2012
SubaruImprezaWRX Premium2013
SubaruImprezaWRX Premium2014
SubaruImprezaWRX STI2008
SubaruImprezaWRX STI2009
SubaruImprezaWRX STI2010
SubaruImprezaWRX STI2011
SubaruImprezaWRX STI2012
SubaruImprezaWRX STI2013
SubaruImprezaWRX STI2014
SubaruImprezaWRX STI Limited2011
SubaruImprezaWRX STI Limited2012
SubaruImprezaWRX STI Limited2013
SubaruImprezaWRX STI Limited2014
SubaruImprezaWRX STI Special Edition2010