AEM Cold Air Intake
Details
AEM Cold Air Intake
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
The AEM 21-478WR fits some Subaru Impreza WRX, Subaru Impreza WRX STi, Subaru WRX, and Subaru WRX STI models. See vehicle applications for details.
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.
Specifications AEM 21-478WR Product Specifications
Estimated Horsepower Gain - 36 HP @ 5300 RPM
Replacement Filter - 21-2029DK
Air Filter Color - Red
Air Filter Material - Non-woven Synthetic
Air Filter Outlet Shape - Round
Clamps Included - 3
Clamp Material - Steel
Clamp Style - Regular
Couplers Included - None
Product Style - AEM Cold Air Intake System
Air Filter Height - 9.125 in (232 mm)
Intake Pipe Color / Finish - Wrinkle Red
Intake Pipe Material - Aluminum
CARB EO Number - D-670-21
Street Legal In All US States - Yes
TUV Approved (Europe) - No
Weight - 7.4 lb (3.3 kg)
Air Filter Large End Diameter - 6 in (152 mm)
Product Box Height - 12.25 in (311 mm)
Product Box Length - 20.25 in (514 mm)
Product Box Width - 12.25 in (311 mm)
Mounting Hardware Included - Yes
Horsepower gains based on similar vehicle dynamometer test. Results will vary.
Applications:
2014 Subaru WRX STI 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2014 Subaru WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2014 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2014 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2013 Subaru WRX STI 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2013 Subaru WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2013 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2013 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2012 Subaru WRX STI 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2012 Subaru WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2012 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2012 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2011 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2011 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2010 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2010 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2009 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2009 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2008 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2008 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
More Information
| Part Number | 21-478WR |
|---|---|
| Brand | AEM |
| Type of Part | Intakes |
| Engine Fitment | 2.5L |
| Length | 20 |
| Width | 13 |
| Height | 13 |
| Weight | 9.000000 |
Reviews
Fitment
AEM Cold Air Intake
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
The AEM 21-478WR fits some Subaru Impreza WRX, Subaru Impreza WRX STi, Subaru WRX, and Subaru WRX STI models. See vehicle applications for details.
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.
Specifications AEM 21-478WR Product Specifications
Estimated Horsepower Gain - 36 HP @ 5300 RPM
Replacement Filter - 21-2029DK
Air Filter Color - Red
Air Filter Material - Non-woven Synthetic
Air Filter Outlet Shape - Round
Clamps Included - 3
Clamp Material - Steel
Clamp Style - Regular
Couplers Included - None
Product Style - AEM Cold Air Intake System
Air Filter Height - 9.125 in (232 mm)
Intake Pipe Color / Finish - Wrinkle Red
Intake Pipe Material - Aluminum
CARB EO Number - D-670-21
Street Legal In All US States - Yes
TUV Approved (Europe) - No
Weight - 7.4 lb (3.3 kg)
Air Filter Large End Diameter - 6 in (152 mm)
Product Box Height - 12.25 in (311 mm)
Product Box Length - 20.25 in (514 mm)
Product Box Width - 12.25 in (311 mm)
Mounting Hardware Included - Yes
Horsepower gains based on similar vehicle dynamometer test. Results will vary.
Applications:
2014 Subaru WRX STI 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2014 Subaru WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2014 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2014 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2013 Subaru WRX STI 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2013 Subaru WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2013 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2013 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2012 Subaru WRX STI 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2012 Subaru WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2012 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2012 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2011 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2011 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2010 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2010 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2009 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2009 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2008 Subaru Impreza WRX STi 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
2008 Subaru Impreza WRX 2.5L H4 F/I
All Models Street Legal In All US States:Yes
CARB EO Number: D-670-21 TUV Approved (Europe): No
