AEM Induction Systems / 21-478WR
Part #: 21-478WR
UPC: 840879019266
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Description: AEM'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.
Description:
This is a Test Product Message for the Air Intakes Category!
This part number superseded 21-478SPT.
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.
Features & benefits
- 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.
Information
Associated products: AEM-1-4001 Air Filter Wrap, AEM-21-2029DK AEM DryFlow Air Filter, AEM-1-1000 Air Filter Cleaner
Application summary
| Year | Make / model |
|---|---|
| 2008-2014 | Subaru Impreza |
| 2012-2014 | Subaru WRX |
| 2013-2014 | Subaru WRX STI |
Specifications
- GTIN
- 00840879019266
- Weight
- 7.36 lb
- Height
- 12.25 in
- Length
- 20.25 in
- Width
- 12.25 in
- EO
- Legal US
- Life cycle
- Available to Order
- Alt. part number
- AEM-21-478WR
- AAM brand code
- AEK
- Warehouse brand code
- AEK
- AAIA brand code
- DSHD
Attributes
- AAM Standard Pack
- 1
- Air Box Included
- No
- Air Filter Color
- Red
- Air Filter Element Washable
- Yes
- 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 Oulet Length
- 2.750 in. (70mm)
- Air Filter Oulet Width
- 2.750 in. (70mm)
- Air Filter Outlet Length
- 2.75 in (70 mm)
- Air Filter Outlet Shape
- Round
- Air Filter Outlet Width
- 2.75 in (70 mm)
- Air Filter Washable
- Yes
- Alternate Part Number
- AEM-21-478WR
- CARB EO Number
- D-670-21
- California Proposition 65
- WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov
- Clamp Color
- Natural
- Clamp Color/Finish
- Natural
- Clamp Material
- Steel
- Clamp Quantity
- 3
- Clamp Style
- Regular
- Clamps Included
- 3
- Coupler Color
- Not Applicable
- Coupler Color/Finish
- Black
- Couplers Included
- 1
- Estimated Horse Power Gain
- 36 HP @ 5300 RPM
- Estimated Horsepower Gain
- 36 HP @ 5300 RPM
- Filter Color
- Red
- Filter Material
- Non-woven Synthetic
- Horse Power Increase
- 36 HP
- Intake Pipe Color
- Wrinkle Red
- Intake Pipe Color / Finish
- Wrinkle Red
- Intake Pipe Inlet Length
- 19 in (483 mm)
- Intake Pipe Inlet Shape
- Round
- Intake Pipe Inlet Width
- 2.75 in (70 mm)
- Intake Pipe Material
- Aluminum
- Intake Pipe Outlet Length
- 19 in (483 mm)
- Intake Pipe Outlet Shape
- Round
- Intake Pipe Outlet Width
- 2.75 in (70 mm)
- Intake Pipe Ports
- All intake tube ports needed for the specified applications are included
- Item Weight
- 7.400 lbs. (3.3 kg)
- Mass Air Flow Sensor Adapter Included
- Yes
- Mass Air Flow Sensor Included
- Mass Air Flow Sensor Adapter Included When Required
- Mounting Hardware Included
- Yes
- Oil Included
- No Filter Oil Required
- Package Material
- Paperboard
- Package Type
- Box
- Product Box Height
- 12.250 in. (311mm)
- Product Box Length
- 20.250 in. (514mm)
- Product Box Width
- 12.250 in. (311mm)
- Product Style
- AEM Cold Air Intake System
- RPM
- 5300
- Replacement Filter
- 21-2029DK
- Street Legal
- Yes
- Street Legal In All US States
- Legal for use in all 50 states.
- System Type
- Cold Air Induction
- TUV Approved (Europe)
- No
- Title
- AEM AEM-21-478WR Cold Air Intake System
- Warranty
- Limited Lifetime
- Weight
- 7.4 lb (3.3 kg)
Fitment status
Select a vehicle or engine to see whether this part applies to your application.
Application summary
2008-2014 Subaru Impreza; 2012-2014 Subaru WRX; 2013-2014 Subaru WRX STI
Resources
- Brand logo
- Technical Drawing
- Installation Instructions
- Logo Image
- Logo Image
- Photo - In Package
- Photo - In Package
- Photo - In Package
- Photo - In Package
- Photo - In Package
- Photo - In Package
- Photo - In Package
- Photo - Primary
- Photo - Mounted
- Street, Track, Show | AEM Induction
- AEM Formula D Drivers race each other on Go Karts!
AEM Induction Systems 21-478WR
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