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Part:   21-686C

AEM 21-686C 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
  • 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 21-686C fits some Honda Civic models. See vehicle applications for details.
The AEM 21-686C 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 is designed, tuned and dyno-tested to fit specific Honda Civic 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 above the driver's side wheel well 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 and PCV hose. The cone 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 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 21-686C vehicle applications to determine the legal status for each vehicle.

[More Information on AEM Cold Air Intake Systems]
Specifications AEM 21-686C Product Specifications
Estimated Horsepower Gain4 HP @ 3800 RPM
Air Filter ColorRed
Air Filter Height5.125 in (130 mm)
Air Filter Large End Diameter6 in (152 mm)
Air Filter MaterialNon-woven Synthetic
Air Filter Outlet ShapeRound
CARB EO NumberD-670-21
Clamp MaterialSteel
Clamp StyleRegular
Clamps Included9
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 Filter21-201DK
Street Legal In All US StatesYes
TUV Approved (Europe)No
Weight10 lb (4.5 kg)

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

Shane Cogar from Denver, Colorado
April 27, 2015 - Part 21-686C
I've always loved AEM intakes for their dryflow filters. The whole assembly took me about 35 minutes to install and to my pleasant surprise, I didn't have to cut any of my inner wheel liner like I had read in the instructions. I knew I wouldn't gain a huge amount of power, but what it did do was smooth out the power I do have tremendously. I have, and always will, recommend this product to anyone in the market for an intake system.