AEM Induction Cold Air Intake System for 2018 Subaru WRX STI
Part # 21-836WR
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
The AEM 21-836WR 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 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 tapered 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.
Specifications
| Air Box Included | No |
|---|---|
| Air Filter Color | Red |
| Air Filter Material | Non-woven Synthetic |
| Air Filter Outlet Shape | Round |
| Air Filter Washable | Yes |
| CARB EO Number | D-670-25 |
| 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 | 22.1 HP @ 6217 RPM |
| Intake Pipe Color / Finish | Wrinkle Red |
| 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 | Legal for use in all 50 states. |
| TUV Approved (Europe) | No |
| Weight | 10 lb (4.5 kg) |
| UPC / GTIN | 00024844367952 |
| Warranty | Limited Lifetime warranty |
| Year | Make | Model | Engine | Note |
|---|---|---|---|---|
| 2018 | Subaru | WRX STI | 2.5L H4 | California Air Resources Board Exempt: Yes; CARB EO: D-670-25; AEM - Metal Intake System; Wrinkle Red (CAS) |