The AEM cold air intake system is engineered to increase horsepower and torque with an oversized AEM Dryflow synthetic washable air filter, a mandrel-bent aluminum intake tube, and high-quality hardware. The oversized conical filter design allows up to 100,000 miles between filter services under normal highway driving. A custom heat shield helps protect intake air from engine bay heat, and the factory fresh-air duct attaches directly to the heat shield. The complete system typically installs in under 90 minutes.
Specifications:
- Finish: Gunmetal Gray
- Filter: Oversized AEM Dryflow synthetic, washable and reusable
- Intake tube: Mandrel-bent aluminum
- Includes custom heat shield with factory fresh-air duct attachment
- Typical install time: under 90 minutes
- Part Number: 21-478C
Vehicle Applications
- 2008 Subaru Impreza WRX
- 2009 Subaru Impreza WRX
- 2010 Subaru Impreza WRX
- 2011 Subaru Impreza WRX
- 2012 Subaru Impreza WRX
- 2013 Subaru Impreza WRX
- 2014 Subaru Impreza WRX
- 2010 Subaru Impreza WRX Limited
- 2011 Subaru Impreza WRX Limited
- 2012 Subaru Impreza WRX Limited
- 2013 Subaru Impreza WRX Limited
- 2014 Subaru Impreza WRX Limited
- 2009 Subaru Impreza WRX Premium
- 2010 Subaru Impreza WRX Premium
- 2011 Subaru Impreza WRX Premium
- 2012 Subaru Impreza WRX Premium
- 2013 Subaru Impreza WRX Premium
- 2014 Subaru Impreza WRX Premium
- 2008 Subaru Impreza WRX STI
- 2009 Subaru Impreza WRX STI
- 2010 Subaru Impreza WRX STI
- 2011 Subaru Impreza WRX STI
- 2012 Subaru Impreza WRX STI
- 2013 Subaru Impreza WRX STI
- 2014 Subaru Impreza WRX STI
- 2011 Subaru Impreza WRX STI Limited
- 2012 Subaru Impreza WRX STI Limited
- 2013 Subaru Impreza WRX STI Limited
- 2014 Subaru Impreza WRX STI Limited
- 2010 Subaru Impreza WRX STI Special Edition
Additional Documentation
FAQ
What does this intake system include?
An oversized AEM Dryflow synthetic air filter, mandrel-bent aluminum intake tube, custom heat shield with factory fresh-air duct attachment, and all necessary installation hardware.
How often does the filter need to be serviced?
Under normal highway driving conditions, the oversized conical filter can go up to 100,000 miles between services.
Which Subaru Impreza WRX/STI years does this fit?
2008-2014 Subaru Impreza WRX, WRX Limited, WRX Premium, WRX STI, WRX STI Limited, and the 2010 WRX STI Special Edition. See the Vehicle Applications section for the full year-by-year breakdown.