• AEM Cold Air Intake System, 2008-2014 Subaru Impreza WRX/STI, Gunmetal Gray | 21-478C
    • AEM Cold Air Intake System, 2008-2014 Subaru Impreza WRX/STI, Gunmetal Gray | 21-478C
    • AEM Cold Air Intake System, 2008-2014 Subaru Impreza WRX/STI, Gunmetal Gray | 21-478C
    • AEM Cold Air Intake System, 2008-2014 Subaru Impreza WRX/STI, Gunmetal Gray | 21-478C

    AEM Cold Air Intake System, 2008-2014 Subaru Impreza WRX/STI, Gunmetal Gray | 21-478C

    Vendor: AEM Induction
    Part Number: 21-478C
    $314.99

    In Stock

    Not sure it fits your vehicle?
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    Product DetailsFAQReviewsRelated Products

    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
    Installation Instructions
    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.

    Shipping Policy
    • Free shipping on orders over $99 (excludes freight shipments).
    • In-stock orders typically ship within 1 to 2 business days. Weekend and holiday orders are processed the next business day.
    • Orders ship from Defiance, Ohio and a nationwide network of warehouses and manufacturers.
    • Items showing an ETA are not in stock yet. ETAs come from the manufacturer and can change.
    • No P.O. Boxes. International orders need a shipping quote, so email us first.

    Read the full Shipping Policy
    Return Policy
    • 30-day return window from the ship date. Returns must be approved first; email sales@berryperformancesales.com with your order number.
    • Items must be unused, complete and in the original packaging.
    • A 20% restocking fee applies, and return shipping is paid by the buyer.
    • Not returnable: installed or modified parts, opened or used programmers and tuners, custom orders, Open Box, and Clearance or Final Sale items.
    • Damaged, defective or incorrect items must be reported within 48 hours of delivery with photos.

    Read the full Return Policy
    Disclaimer

    All products are sold for off-road use only unless otherwise specified. Buyer assumes all responsibility for installation and operation. Seller is not liable for any incidental, indirect, or consequential damages — including engine failure, labor costs, or vehicle downtime — resulting from the use of any product sold.

    By making a purchase from Berry Performance Sales, you acknowledge and agree to abide by the terms and conditions of these Policies.

    For any questions or concerns, please contact us — we’re always happy to help.

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