{"product_id":"aem-induction-21-478wr-performance-cold-air-intake-system-for-subaru-wrx-and-wrx-sti","title":"AEM Induction 21-478WR Performance Cold Air Intake System for Subaru WRX and WRX STI","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.\nAEM'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.\nAssociated products: AEM-1-4001 Air Filter Wrap, AEM-21-2029DK AEM DryFlow Air Filter, AEM-1-1000 Air Filter Cleaner\n\u003cul\u003e\n  \u003cli\u003eUtilizes washable, reusable, oil-free synthetic filter media that preserves airflow efficiency, traps harmful contaminants, and provides long-term value over disposable filters.\u003c\/li\u003e\n  \u003cli\u003eAEM Lifetime Limited Warranty\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003cp\u003eThe AEM Induction 21-478WR Performance Cold Air Intake System is engineered to improve horsepower, torque, throttle response, and acceleration by replacing the restrictive factory air filter, intake tubing, and airbox assembly. Designed, tuned, and dyno-tested for select Subaru WRX, WRX STI, Impreza WRX, and Impreza WRX STI applications, this system delivers increased airflow while retaining compatibility with the factory mass air flow sensor and emissions control equipment.\u003c\/p\u003e\u003cp\u003eAn oversized AEM Dryflow synthetic air filter provides efficient filtration without the use of oil. Its washable and reusable media is designed for extended service life and may be used for up to 100,000 miles before cleaning, depending on driving conditions. The filter remains positioned in the original airbox area and is protected by a heat shield that helps reduce intake air temperatures for consistent performance. Mandrel-bent aluminum intake tubing features a durable textured red powder-coated finish and supports smooth, unrestricted airflow.\u003c\/p\u003e\u003cp\u003eThe AEM 21-478WR intake is designed for straightforward installation using commonly available tools and is backed by AEM's Lifetime Limited Warranty. This application carries California Air Resources Board Executive Order D-670-21 and is EPA compliant; verify vehicle-specific emissions legality before installation in California or other states that follow California emissions standards. Fitment data indicates compatibility with select 2008–2014 Subaru Impreza models, including WRX and WRX STI applications. Associated products include the AEM Air Filter Wrap, AEM DryFlow Air Filter, and AEM Air Filter Cleaner.\u003c\/p\u003e\u003cp\u003e\u003cstrong\u003eWhat's Included:\u003c\/strong\u003e Performance intake tubing, AEM Dryflow synthetic washable air filter, heat shield, mounting hardware, and installation components.\u003c\/p\u003e\u003cp\u003e\u003cb\u003eFeatures:\u003c\/b\u003e\u003c\/p\u003e\u003cul\u003e\n\u003cli\u003ePerformance Gains: Replaces restrictive factory intake components to improve airflow, horsepower, torque, throttle response, and acceleration.\u003c\/li\u003e\n\u003cli\u003eAEM Dryflow Filter: Uses washable, reusable, oil-free synthetic filter media for efficient filtration and long-term airflow performance.\u003c\/li\u003e\n\u003cli\u003eHeat Shield Protection: Positions the air filter in the original airbox area and helps reduce exposure to hot engine-compartment air.\u003c\/li\u003e\n\u003cli\u003eDurable Construction: Includes mandrel-bent aluminum intake tubing with a textured red powder-coated finish and is backed by AEM's Lifetime Limited Warranty.\u003c\/li\u003e\n\u003c\/ul\u003e\u003cbr\u003e\nFitments:\u003cbr\u003e\n2008 Subaru Impreza WRX\u003cbr\u003e\n2008 Subaru Impreza WRX STI\u003cbr\u003e\n2009 Subaru Impreza WRX\u003cbr\u003e\n2009 Subaru Impreza WRX Premium\u003cbr\u003e\n2009 Subaru Impreza WRX STI\u003cbr\u003e\n2010 Subaru Impreza WRX\u003cbr\u003e\n2010 Subaru Impreza WRX Limited\u003cbr\u003e\n2010 Subaru Impreza WRX Premium\u003cbr\u003e\n2010 Subaru Impreza WRX STI\u003cbr\u003e\n2010 Subaru Impreza WRX STI Special Edition\u003cbr\u003e\n2011 Subaru Impreza 2.5i\u003cbr\u003e\n2011 Subaru Impreza 2.5i Premium\u003cbr\u003e\n2011 Subaru Impreza Outback Sport\u003cbr\u003e\n2011 Subaru Impreza WRX\u003cbr\u003e\n2011 Subaru Impreza WRX Limited\u003cbr\u003e\n2011 Subaru Impreza WRX Premium\u003cbr\u003e\n2011 Subaru Impreza WRX STI\u003cbr\u003e\n2011 Subaru Impreza WRX STI Limited\u003cbr\u003e\n2012 Subaru Impreza WRX\u003cbr\u003e\n2012 Subaru Impreza WRX Limited\u003cbr\u003e\n2012 Subaru Impreza WRX Premium\u003cbr\u003e\n2012 Subaru Impreza WRX STI\u003cbr\u003e\n2012 Subaru Impreza WRX STI Limited\u003cbr\u003e\n2013 Subaru Impreza WRX\u003cbr\u003e\n2013 Subaru Impreza WRX Limited\u003cbr\u003e\n2013 Subaru Impreza WRX Premium\u003cbr\u003e\n2013 Subaru Impreza WRX STI\u003cbr\u003e\n2013 Subaru Impreza WRX STI Limited\u003cbr\u003e\n2014 Subaru Impreza WRX\u003cbr\u003e\n2014 Subaru Impreza WRX Limited\u003cbr\u003e\n2014 Subaru Impreza WRX Premium\u003cbr\u003e\n2014 Subaru Impreza WRX STI\u003cbr\u003e\n2014 Subaru Impreza WRX STI Limited\u003cstyle\u003etable.productattributes, .productattributes td { border-bottom: 1px solid #ddd; border-collapse: collapse; padding: 2px; text-align: left; }\u003c\/style\u003e\n\u003ctable class=\"productattributes\"\u003e\n\u003cthead\u003e\u003ctr\u003e\u003c\/tr\u003e\u003c\/thead\u003e\n\u003ctbody\u003e\n\u003ctr\u003e\u003ctd\u003eAir Freight Prohibited: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eNot Carb Approved: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eCarb Eo Number: D-670-21\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eLtl Freight Required: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eProp 65: Y\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003ePart Type: automotive\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eEpa: Compliant\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eCarb Acknowledgement Required: false\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eRegular Stock: t\u003c\/td\u003e\u003c\/tr\u003e\n\u003ctr\u003e\u003ctd\u003eUnits Per Sku: 1\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/tbody\u003e\n\u003c\/table\u003e\u003cbr\u003e","brand":"AEM Induction","offers":[{"title":"Default Title","offer_id":67616347750652,"sku":"21-478WR","price":375.01,"currency_code":"USD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0641\/6518\/3740\/files\/eaca4708c91d3b74d35e93b6749cc7b5.jpg?v=1790822742","url":"https:\/\/diycustoms.store\/products\/aem-induction-21-478wr-performance-cold-air-intake-system-for-subaru-wrx-and-wrx-sti","provider":"diycustoms.store","version":"1.0","type":"link"}