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Part:   21-687C

AEM 21-687C 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
  • Washable and reusable oil-free filter media
  • Air filter lasts up to 100,000 miles before cleaning is required (depending on driving conditions)
  • AEM Lifetime Limited Warranty

The AEM 21-687C fits some Hyundai Genesis Coupe models. See vehicle applications for details.
The AEM 21-687C 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 Hyundai Genesis Coupe 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 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 engine breather hoses. A replacement windshield washer bottle is included to adapt to the new shape of the air intake system. 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). 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 21-687C vehicle applications to determine the legal status for each vehicle.

[More Information on AEM Cold Air Intake Systems]
Specifications AEM 21-687C Product Specifications
Estimated Horsepower Gain7.0 HP @ 6500 RPM
Replacement Filter21-2047DK
Air Filter ColorRed
Air Filter MaterialNon-woven Synthetic
Air Filter Outlet ShapeRound
Clamps Included5
Clamp MaterialSteel
Clamp StyleRegular
Couplers IncludedNone
Product StyleAEM Cold Air Intake System
Air Filter Height7 in (178 mm)
Intake Pipe Color / FinishGunmetal Gray
Intake Pipe MaterialAluminum
CARB EO NumberD-670-21
Street Legal In All US StatesYes
TUV Approved (Europe)No
Weight7.8 lb (3.5 kg)
Air Filter Large End Diameter5.25 in (133 mm)
Product Box Height14.94 in (379 mm)
Product Box Length22.2 in (564 mm)
Product Box Width14.5 in (368 mm)
Mounting Hardware IncludedYes
WarrantyLimited Lifetime

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

Jorge from Texas
October 30, 2016 - Part 21-687C
This intake sounds and looks awesome. Installation was easy, everything fits perfectly and no leaks from washer bottle. I'm happy with the product and recommend it.
Jonathan from Texas
July 18, 2016 - Part 21-687C
This intake is awesome! The hardest part about the whole install was taking the factory intake out, the install for the AEM intake literally took 15 minutes. It makes the car sound a whole lot better even with just the factory recirculation valve, and I can feel a slight difference with the response of the throttle. I would HIGHLY recommend this product over any other intake on the market.
Matt from Virginia
July 17, 2014 - Part 21-687C
Product is awesome. I have a 2.0 engine and it doesn't do much for me with power but it gives it a great mean sound. Very professional kit. Easy install. Took my buddy and I maybe 1 1/2 hours tops. Definitely recommend this product!!