The AEM 21-732C cold air intake replaces the restrictive factory air filter and intake housing on specific Subaru WRX models with a system engineered, tuned, and dyno-tested for horsepower and torque gains. Air is drawn through an oversized AEM Dryflow synthetic washable filter mounted in the stock air box location and shielded from underhood heat, while mandrel-bent aluminum tubing finished in gunmetal gray powder coat routes air to the throttle body. The system retains the factory mass air flow sensor for a clean installation with common hand tools.
Installation InstructionsVehicle Applications Sheet
Specifications:
- Filter Type: AEM Dryflow oil-free, washable, reusable synthetic media (cleanable up to 100,000 miles between services)
- Filter Shape: Tapered cylinder
- Tube Material: Mandrel-bent aluminum
- Finish: Gunmetal gray powder coat
- Warranty: AEM Lifetime Limited Warranty
- Emissions Note: 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; check vehicle-specific legal status before purchase.
- Part Number: 21-732C
Vehicle Applications
- 2015 Subaru WRX Base
- 2016 Subaru WRX Base
- 2017 Subaru WRX Base
- 2018 Subaru WRX Base
- 2019 Subaru WRX Base
- 2020 Subaru WRX Base
- 2015 Subaru WRX Limited
- 2016 Subaru WRX Limited
- 2017 Subaru WRX Limited
- 2018 Subaru WRX Limited
- 2019 Subaru WRX Limited
- 2020 Subaru WRX Limited
- 2015 Subaru WRX Premium
- 2016 Subaru WRX Premium
- 2017 Subaru WRX Premium
- 2018 Subaru WRX Premium
- 2019 Subaru WRX Premium
- 2020 Subaru WRX Premium
FAQ
What years of Subaru WRX fit the AEM 21-732C?
The AEM 21-732C fits 2015-2020 Subaru WRX Base, Limited, and Premium trims.
Does it require tuning after installation?
The system is designed, tuned, and dyno-tested to work with the factory mass air flow sensor and emissions hardware, so no additional tuning is required for a straightforward installation.
How long does the filter last before cleaning?
The AEM Dryflow filter can go up to 100,000 miles before cleaning is needed, depending on driving conditions.
