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AEM Induction Cold Air Intake System for Subaru

Part # 21-478C

  • Precision-tuned and dyno-validated to enhance throttle response, sharpen acceleration, and improve overall engine efficiency, helping maximize horsepower and drivability.
  • Creates a deeper, more aggressive induction tone that highlights the intake system’s improved airflow.
  • Features low-restriction intake tubing that increases air velocity and high-volume airflow for maximum performance gains.
  • Equipped with a long-life, high-capacity air filter capable of up to 100,000 miles before servicing (depending on driving conditions), reducing maintenance while maintaining strong, clean airflow.
  • Utilizes washable, reusable, oil-free synthetic filter media that preserves airflow efficiency, traps harmful contaminants, and provides long-term value over disposable filters.

Description

AEM cold air intake systems are designed to increase horsepower and torque. The system includes an oversized AEM DRYFLOW synthetic washable air filter, engineered to provide outstanding airflow, filtration, and performance, and also features a mandrel-bent aluminum intake tube and high quality hardware. The oversized, conical filter design allows you to go up to 100,000 miles between filter services under normal highway driving conditions. A custom heat shield helps protect intake air from the high temperature of your engine bay, and the factory fresh air duct attaches to the heat shield. The entire system can typically be installed in less than 90 minutes.

Specifications

Air Box IncludedNo
Air Filter ColorRed
Air Filter MaterialNon-woven Synthetic
Air Filter Outlet ShapeRound
Air Filter WashableYes
California RestrictedNot legal for sale or use in California
Clamp Color/FinishNatural
Clamp MaterialStainless Steel
Clamp StyleWorm Gear
Clamps Included2
Coupler Color/FinishBlack
Couplers Included1
Estimated Horsepower Gain36 HP @ 5300 RPM
Intake Pipe Color / FinishGunmetal Gray
Intake Pipe MaterialAluminum
Intake Pipe PortsAll intake tube ports needed for the specified applications are included
Mass Air Flow Sensor Adapter IncludedNo
Mounting Hardware IncludedYes
Oil IncludedNo
Package MaterialCorrugated
Package TypeBox
Product StyleAEM Cold Air Intake System
Replacement Filter21-2129D
Street Legal In All US StatesNot legal for sale or use in California on any pollution controlled motor vehicle.
TUV Approved (Europe)No
Weight7.4 lb (3.3 kg)
UPC / GTIN00024844391216
WarrantyLimited Lifetime warranty

Fits these vehicles

YearMakeModelSubmodelEngineNote
2008SubaruImprezaWRX, WRX STI2.5L H4California Air Resources Board Exempt: No
2009SubaruImprezaWRX, WRX Premium, WRX STI2.5L H4California Air Resources Board Exempt: No
2010SubaruImprezaWRX, WRX GT, WRX Limited, WRX Premium, WRX SE, WRX STI, WRX STI Special Edition2.5L H4California Air Resources Board Exempt: No
2011SubaruImprezaWRX, WRX Limited, WRX Premium, WRX STI, WRX STI Limited2.5L H4California Air Resources Board Exempt: No
2012 - 2014SubaruImpreza-2.5L H4California Air Resources Board Exempt: No
2012 - 2014SubaruWRX-2.5L H4California Air Resources Board Exempt: No
2013 - 2014SubaruWRX STI-2.5L H4California Air Resources Board Exempt: No