AEM Induction Cold Air Intake System for 2019-2021 Subaru WRX STI
Part # 21-863C
Features
- 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.
Description
AEM cold air intake systems are designed to increase horsepower and torque. The system includes an oversized AEM DRYFLOW synthetic washable air filter, engineered to provide outstanding airflow, filtration, and performance, and also features a mandrel-bent aluminum intake tube and high quality hardware. The oversized, conical filter design allows you to go up to 100,000 miles between filter services under normal highway driving conditions. A custom heat shield helps protect intake air from the high temperature of your engine bay, and the factory fresh air duct attaches to the heat shield. The entire system can typically be installed in less than 90 minutes.
Specifications
| Air Box Included | No |
|---|---|
| Air Filter Color | Red |
| Air Filter Material | Non-woven Synthetic |
| Air Filter Outlet Shape | Round |
| Air Filter Washable | Yes |
| California Restricted | Not legal for sale or use in California |
| Clamp Color/Finish | Natural |
| Clamp Material | Stainless Steel |
| Clamp Style | Worm Gear |
| Clamps Included | 3 |
| Coupler Color/Finish | Black |
| Couplers Included | 1 |
| Estimated Horsepower Gain | 16.5 HP @ 5224 RPM |
| Intake Pipe Color / Finish | Gunmetal Gray |
| Intake Pipe Material | Aluminum |
| Intake Pipe Ports | All intake tube ports needed for the specified applications are included |
| Mass Air Flow Sensor Adapter Included | Yes |
| Mounting Hardware Included | Yes |
| Oil Included | No |
| Package Material | Corrugated |
| Package Type | Box |
| Product Style | AEM Cold Air Intake System |
| Replacement Filter | 21-2157DK |
| Street Legal In All US States | Not legal for sale or use in California on any pollution controlled motor vehicle. |
| TUV Approved (Europe) | No |
| Weight | 9.2 lb (4.2 kg) |
| UPC / GTIN | 00024844392077 |
| Warranty | Limited Lifetime warranty |
| Year | Make | Model | Engine | Note |
|---|---|---|---|---|
| 2019 - 2020 | Subaru | WRX STI | 2.5L H4 | California Air Resources Board Exempt: No |
| 2021 | Subaru | WRX STI | 2.5L H4 | California Air Resources Board Exempt: No; AEM - Metal Intake System; Gunmetal Gray (CAS) |