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Part:   21-731C

AEM 21-731C 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 21-731C 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 Ford Fiesta 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 valve cover breather hose. 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. 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 21-731C vehicle applications to determine the legal status for each vehicle.

[More Information on AEM Cold Air Intake Systems]
Specifications AEM 21-731C Product Specifications
Air Filter ColorRed
Air Filter Height5 in (127 mm)
Air Filter MaterialNon-woven Synthetic
Air Filter Outlet ShapeRound
CARB EO NumberD-670-19
Clamp MaterialStainless Steel
Clamp StyleRegular
Clamps Included3
Intake Pipe Color / FinishGunmetal Gray
Intake Pipe MaterialAluminum
Product Box Height8.5 in (216 mm)
Product Box Length18.25 in (464 mm)
Product Box Width14.5 in (368 mm)
Product StyleAEM Cold Air Intake System
Replacement Filter21-2011DK
Street Legal In All US StatesYes
TUV Approved (Europe)No
Weight7.1 lb (3.2 kg)
Reviews Product Reviews

Joseph from San Bernardino, California
March 12, 2016 - Part 21-731C
Just installed, drives like a diffrent car. Way better all around, 3800 RPM and I can let off the gas, this intake is a must have. I drive a 2014 fiesta SE. Its way better to drive and drives way smoother and needs less gas pedal when at low or high speeds.
Joe from Pinion Hills, California
March 12, 2016 - Part 21-731C
Well made, better air hoses than stock, the paint is flawless on the intake and the air filter is flawless. AEM is the best and thats why I bought it. I'll repost Power gains, installing today.