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Part:   21-747C

AEM 21-747C Cold Air Intake

AEM Cold Air Intake System
Rating Star 1 Rating Star 2 Rating Star 3 Rating Star 4 Rating Star 5   4.7
  • 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 21-747C fits some Honda Accord models. See vehicle applications for details.
The AEM 21-747C 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 Honda Accord 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 relocated to the driver-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 crankcase vent tube. 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 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 21-747C vehicle applications to determine the legal status for each vehicle.

[More Information on AEM Cold Air Intake Systems]
Specifications AEM 21-747C Product Specifications
Estimated Horsepower Gain7 HP @ 3700 RPM
Replacement Filter21-2027DK
Air Filter ColorRed
Air Filter MaterialNon-woven Synthetic
Air Filter Outlet ShapeRound
Clamps Included3
Clamp MaterialStainless Steel
Clamp StyleRegular
Couplers Included1
Product StyleAEM Cold Air Intake System
Air Filter Height7 in (178 mm)
Intake Pipe Color / FinishGunmetal Gray
Intake Pipe MaterialAluminum
CARB EO NumberD-670-23
Street Legal In All US StatesSee Vehicle Applications
TUV Approved (Europe)No
Weight8.2 lb (3.7 kg)
Product Box Height10.6 in (269 mm)
Product Box Length35.4 in (899 mm)
Product Box Width13.3 in (338 mm)
Mounting Hardware IncludedYes
WarrantyLimited Lifetime

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

Corey Larson from Citrus Heights, California
September 3, 2018 - Part 21-747C
Installed on my 2016 Honda Accord Sport. After getting tired of the all too quiet stock intake, I decided to give this intake a go. I've had various intakes on other cars and have always liked the CAI over the SRI due to the fact of sound. SRI just makes a 4 cylinder sound more like a lawn mower. CAI makes it sound mean. My reason for such. Installation was straightforward other than removal of the stock resonator (damn bolt you can barely get to). The piping and filter quality were top notch as expected and the included instructions helped a bunch. After installation... Definitely what I was going for. Power between 3 and 5k rpms to me was much nicer and the sound was beyond belief. Made the 2.4 sound almost like a V8 when going through tunnels. I was amazed. This product was definitely worth it and I recommend it to anyone that is looking for something more from their car.
Javere from Fort Lauderdale, Florida
February 26, 2017 - Part 21-747C
The intake system really gave my car a boost, especially being a i4 manual. Still have to get adjusted to the new sound, but overall a great product.
Josh Mylan from Everett, Washington
November 9, 2015 - Part 21-747C
GREAT product. wanted a little kick to my new car and I got it. bad thing is I keep burning rubber trying to hear it :) definitely would purchase again