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Part:   21-804C

AEM 21-804C 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 21-804C fits some Mazda CX-3, Scion iA, and Toyota Yaris iA models. See vehicle applications for details.
The AEM-21-804C 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 Toyota Yaris iA and Scion iA 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 placed into the original air box space and is protected by a heat shield which is designed to reduce intake air temperature and increase horsepower. The air intake tube 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 airflow sensor and PCV line. 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. This air intake cannot be sold in California. It is not legal for use in California or other states adopting California emission standards.

[More Information on AEM Cold Air Intake Systems]
Specifications AEM 21-804C Product Specifications
Estimated Horsepower Gain7 HP @ 4400 RPM
Replacement Filter21-2011DK
Air Filter ColorRed
Air Filter MaterialNon-woven Synthetic
Air Filter Outlet ShapeRound
Clamps Included2
Clamp MaterialStainless Steel
Clamp StyleWorm Gear
Couplers Included1
Product StyleAEM Cold Air Intake System
Intake Pipe Color / FinishGunmetal Gray
Intake Pipe MaterialAluminum
Street Legal In All US States No
TUV Approved (Europe)No
Weight8.5 lb (3.9 kg)
Product Box Height12.25 in (311 mm)
Product Box Length20.25 in (514 mm)
Product Box Width12.25 in (311 mm)
California RestrictedNot legal for sale or use in California
Mounting Hardware IncludedYes
WarrantyLimited Lifetime

Horsepower gains based on similar vehicle dynamometer test. Results will vary.
WARNING: Cancer and reproductive
Reviews Product Reviews

Joel Rippe from Gainesboro, Tennessee
May 19, 2017 - Part 21-804C
Easy to install. Great product. I wanted a little more kick and better audio from my engine. This delivered both. I notice an improvement when driving on inclines. I have reduced the need to downshift. if you have your tools ready to go you should have the install done in around 30 minutes.
Tyler Butler from Duvall, Washington
April 14, 2017 - Part 21-804C
Easy to install. Paired with a muffler delete, this intake makes the iA sound fantastic. Would recommend this to anyone who likes their iA but wants to hear some induction noise.
Sebastian Hernandez from San Antonio, Texas
March 17, 2017 - Part 21-804C
Makes a huge difference on the performance and the sound of the small engine. Paired this with a muffler delete and the car sounds mean. (Complimented for making this 1.5L sound like a loud V6) A must have for this vehicle.