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Part:   21-509C

AEM 21-509C 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 21-509C 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 Acura CL Type-S 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 and was developed to accommodate the engine’s factory emissions control devices. 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 and it 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 21-509C vehicle applications to determine the legal status for each vehicle.

[More Information on AEM Cold Air Intake Systems]
Specifications AEM 21-509C Product Specifications
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-670-15
Clamp MaterialSteel
Clamp StyleRegular
Clamps Included5
ColorGunmetal Gray
Intake Pipe Color / FinishGunmetal Gray
Intake Pipe MaterialAluminum
Product Box Height10.6 in (269 mm)
Product Box Length35.4 in (899 mm)
Product Box Width13.3 in (338 mm)
Product StyleAEM Cold Air Intake System
Replacement Filter21-203DK
Street Legal In All US StatesYes
TUV Approved (Europe)No
Weight7 lb (3.2 kg)
Reviews Product Reviews

Ulric Clarke from Little Elm, Texas
July 30, 2016 - Part 21-509C
Very knowledgeable helpful staff. Ordering process was very easy after I spoke to the rep and made sure I was ordering the correct intake. Installation was a breeze, instructions were clear and easy to follow. Initially I ordered the intake from (Brand Name) and they botched the order sending me the incorrect part. After returning the item, I contacted K&N, they got it right the first time. Great experience.