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Part:   21-786C

AEM 21-786C Cold Air Intake

AEM Cold Air Intake System
  • Increases horsepower
  • Tuned and dyno-tested to improve acceleration and engine sound
  • Aluminum coolant overflow reservoir attached to heat shield to replace stock reservoir
  • 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
  • Low restriction aluminum tubing

The AEM 21-786C fits some Mazda MX-5 Miata models. See vehicle applications for details.
The AEM-21-786C 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 select Mazda MX-5 Miata 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. Attached to the heat shield is an aluminum coolant overflow reservoir that replaces the stock reservoir so that the air intake will fit properly. The air 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 and PCV 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 21-786C vehicle applications to determine the legal status for each vehicle.

[More Information on AEM Cold Air Intake Systems]
Specifications AEM 21-786C Product Specifications
Estimated Horsepower Gain8 HP @ 6000 RPM
Air Filter ColorRed
Air Filter MaterialNon-woven Synthetic
Air Filter Outlet ShapeRound
California RestrictedNot legal for sale or use in California
Clamp MaterialStainless Steel
Clamp StyleRegular
Clamps Included3
Couplers Included1
Intake Pipe Color / FinishGunmetal Gray
Intake Pipe MaterialAluminum
Product Box Height12.25 in (311 mm)
Product Box Length20.25 in (514 mm)
Product Box Width12.25 in (311 mm)
Product StyleAEM Cold Air Intake System
Replacement Filter21-2157DK
Street Legal In All US States No
TUV Approved (Europe)No
Weight8 lb (3.6 kg)

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