AEM Cold Air Intake System | 2008-2014 Subaru WRX/STI (21-478WR)

Cold Air Intake System by AEM

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.

Features

• Increased horsepower
• Tuned and dyno-tested to improve acceleration and engine sound
• Low restriction aluminum tubing
• Easy to install using commonly available tools
• Air filter lasts up to 100,000 miles before cleaning is required (depending on driving conditions)
• Washable and reusable oil-free filter media
• AEM Lifetime Limited Warranty
• Estimated Horsepower Gain: 36 HP @ 5300 RPM
• Air Filter Color: Red
• Air Filter Height: 9.125 in (232 mm)
• Air Filter Large End Diameter: 6 in (152 mm)
• Air Filter Material: Non-woven Synthetic
• Air Filter Outlet Shape: Round
• Clamp Material: Steel
• Clamp Style: Regular
• Intake Pipe Color / Finish: Wrinkle Red
• Intake Pipe Material: Aluminum
• Product Box Height: 12.25 in (311 mm)
• Product Box Length: 20.25 in (514 mm)
• Product Box Width: 12.25 in (311 mm)
• Product Style: AEM Cold Air Intake System
• Replacement Filter: 21-2029DK
• Street Legal In All US States: Yes
• TUV Approved (Europe): No
• Weight: 7.4 lb (3.3 kg)

Applications

• 2012-2014 SUBARU WRX STI 2.5L H4 F/I – All
• 2012-2014 SUBARU WRX 2.5L H4 F/I – All
• 2008-2014 SUBARU IMPREZA WRX STI 2.5L H4 F/I – All
• 2008-2014 SUBARU IMPREZA WRX 2.5L H4 F/I – All

What’s In The Box?

• Performance Cold Air Intake System
• Clamps Included: 3

Installation Instructions

• Click Here for Installation Instructions