AEM Cold Air Intake for the Subaru WRX STI

Pump In That Cold Air


AEM WRX STI cold air intake


For select Subaru WRX STI models, AEM’s new Performance Cold Air Intake System increases both horsepower and torque by replacing the factory air filter and air-intake housing. Air enters an oversized AEM Dryflow oil-free, synthetic washable air filter, located in the original air filter box space and protected by a heat shield. The Dryflow air filter can be used for up to 100,000 miles before needing to be cleaned. The heat shield reduces intake air temperature and helps increase horsepower. Mandrel-bent aluminum intake tubing is finished with a durable, textured red powder-coating. The system was created to accommodate the factory emissions control devices in your WRX STI, including the mass airflow sensor. The whole system is easy to install with common tools and is backed by AEM’s Limited Lifetime Warranty.


AEM WRX STI 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


AEM 21-836WR Product Specifications

– Estimated horsepower gain: 22.1 HP @ 6217 RPM
– Replacement filter: 21-2157DK
– Air filter color: Red
– Air filter material: Non-woven synthetic
– Air filter outlet shape: Round
– Clamps included: 3
– Clamp material: Stainless steel
– Clamp style: Worm gear
– Couplers included: 1
– Product style: AEM Cold Air Intake System
– Intake pipe color/finish: Wrinkle ted
– Intake pipe material: Aluminum
– Street-legal in all 50 U.S. states: No
– TUV approved (Europe): No
– Weight: 10 lb (4.5 kg)
– California restricted: Not legal for sale or use in California
– Mounting hardware included: Yes
– Warranty: Limited Lifetime

Note: Horsepower gains based on similar vehicle dynamometer test. Results will vary.


Watch the Installation and Review of an AEM Cold Air Intake on a WRX STI


AEM Induction Systems logo


AEM Induction Systems





(800) 992-3000


P.O. Box 1329

Riverside, CA 92502

ABOUT AEM Induction Systems®

Founded in 1987 by John Concialdi and Bob Sullivan as a tuning performance shop, California-based AEM Induction Systems has been a leader in the development of precision-tuned induction systems. The company developed one of the first packaged air induction systems. Today, AEM is still the one to beat.