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Part:   21-732C

AEM 21-732C Cold Air Intake

AEM Cold Air Intake System
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   5.0
  • 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

The AEM 21-732C fits some Subaru WRX models. See vehicle applications for details.
The AEM 21-732C 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 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 gunmetal gray 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 and it is backed by AEM's Lifetime Limited Warranty. 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. View the 21-732C vehicle applications to determine the legal status for each vehicle.

[More Information on AEM Cold Air Intake Systems]
Specifications AEM 21-732C Product Specifications
Estimated Horsepower Gain25 HP @ 4200 RPM
Replacement Filter21-2027DK
Air Filter ColorRed
Air Filter MaterialNon-woven Synthetic
Air Filter Outlet ShapeRound
Clamps Included1
Clamp MaterialStainless Steel
Clamp StyleRegular
Couplers IncludedNone
Product StyleAEM Cold Air Intake System
Air Filter Height7 in (178 mm)
Intake Pipe Color / FinishGunmetal Gray
Intake Pipe MaterialAluminum
CARB EO NumberD-670-24
Street Legal In All US StatesSee Application Link Above
TUV Approved (Europe)No
Weight12.5 lb (5.7 kg)
Product Box Height14.94 in (379 mm)
Product Box Length22.2 in (564 mm)
Product Box Width14.5 in (368 mm)
Mounting Hardware IncludedYes

Horsepower gains based on similar vehicle dynamometer test. Results will vary.
Reviews Product Reviews

Jack Hayes from Louisville, Kentucky
July 8, 2017 - Part 21-732C
Noticeable increase in power, especially above 2000 rpms. Gives some extra kick in an already quick ride. Easy to install, although you may need to remove the mud guard underpanel to reach one of the hose clamps, which isn't mentioned in the instructions.
Anne Haubert from Glastonbury, Connecticut
April 24, 2017 - Part 21-732C
My husband loved it Thanks for the great customer service.
Brian Bowness from Vestavia Hills, Alabama
October 3, 2016 - Part 21-732C
This intake is amazing! The intake really helped awaken my WRX and yes, I do think it has added some power. Thanks AEM for such a great product! :)
Andrew Suhon from Avella, Pennsylvania
July 11, 2016 - Part 21-732C
Intake was easy to install. Came with all necessary parts. Sounds great when you get on the gas. Hard to tell if there is a gain in HP as I only had the car for a brief period before putting this on and wasn't past the break in point. Never really got on the car prior to installing. I'm sure there is somewhat of a gain. You can really hear it suck the air though.
Nate H from Houston, Texas
May 31, 2016 - Part 21-732C
Quick shipping, clear instructions, nice torque addition, well worth the price, a NO-BRAINER.
Michael Patrick from Hawthorne, California
May 30, 2016 - Part 21-732C
Product arrived quickly. It was a snap to install. It looks and sounds great. A noticeable improvement in performance. I contacted their tech support with a couple questions prior to ordering and they were extremely helpful and friendly.
Gary from Massachusetts
April 7, 2016 - Part 21-732C
First, the install was, in fact, as easy as it appears on the instruction sheet and video. I am NOT handy. I have actually never attempted to work on a car before. I was able to successfully install this cold air intake though, and it feels great to have done it. Next, the product appears to be comprised of high quality components. And, it makes a noticeable difference. The lag time to get the turbo going when applying gas is significantly reduced. The psi numbers on the turbo gauge are now lower up to 4,000 RPMs, leading me to believe that the range of power has been expanded. Finally, the look and sound are both fantastic. You can clearly hear the air intake while driving and the rushes of air combined with the turbo blow off valve are just plain fun. Given the low price, easy install and noticeable difference, this a MUST of a mod.