AEM Intakes® 21-681C - Aluminum Gunmetal Gray Cold Air Intake System with Red Filter

77 reviews|Item # mpn1637717
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$399.99
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Vehicle Fitment

Audi

Specifications

Filter Shape
Round
Filter Color
Red
Filter Height
5.25"
Tube Finish
Gunmetal Gray
System Type
Cold Air Intakes
Material
Aluminum
Air Filter Material
Non-woven Synthetic
Replacement Filter
21-202DK
Filter Large End Diameter
6"

Includes

  • Air Intake
  • 3 Steel Regular Clamps

Features

  • Delivers more oxygen to the combustion chamber by drawing in cooler air
  • Custom designed and engineered to deliver maximum power for each specific vehicle
  • Every system includes the innovative, oil-free, high-flow AEM Intakes Dryflow™ air filter
  • Dyno-tuned air intake pipe constructed of mandrel-bent 6061 aluminum for smooth airflow
  • Air filter lasts up to 100,000 miles before cleaning is required (depending on driving conditions)
  • Comes complete with all necessary mounting hardware and comprehensive installation instructions
  • Backed by the AEM Intakes limited lifetime warranty
  • Proudly manufactured in the USA

Product Details

Aluminum Gunmetal Gray Cold Air Intake System (21-681C) by AEM Intakes®. To deliver cooler air to the engine, this air intake system places the air filter outside the engine compartment. Cooler air is denser than warm air and so contains more oxygen, which results in better combustion and more power.

Installation

It’s a well known fact that cooler air is denser and contains more oxygen. Cooler engine air inlet temperatures result in more power. But your stock, restrictive engine air intake system delivers hot air from the engine compartment! The answer to this dilemma is to install an AEM Intakes Cold Air Intake system. AEM Intakes starts by positioning its high-flow Dryflow air filter outside the engine compartment, to draw in the coolest air possible. AEM Intakes performs extensive temperature testing for each application to determine the best filter location. But that’s not the end of the story. The Dryflow air filter is connected to the engine air intake by an aluminum tube tuned in length and diameter to match the engine’s intake resonance. The combination of cold air and tuned free-flowing intake tube results in increased horsepower and torque. And there’s no need to worry about problems with the engine control system when installing an AEM Intakes Cold Air Intake. During development, AEM Intakes monitors the engine control system fuel correction factors and sensors on each vehicle to make sure you won’t get any CHECK ENGINE lights. Like all AEM Intakes air intake systems, the AEM Intakes Cold Air Intake system is made in the USA and backed by a lifetime warranty.

Every AEM Intakes air intake system comes with the innovative, oil-free, high-flow AEM Intakes Dryflow air filter. Each Dryflow filter is engineered to exceed the normal flow capacities of the engine it is required for when clean, while providing outstanding filtration and dust holding capacity. And the flow requirements are exceeded by a wide margin, which allows you plenty of leeway for engine breathing modifications, without needing to worry about having enough intake airflow. The AEM Intakes Dryflow filter is constructed of a unique non-woven polyester-based filter media supported by aluminum screen wire for rigid structural strength. This filter media doesn’t require oil to filter and trap dirt and contaminants, and actually sheds dirt under engine vibration, unlike cotton-gauze, which holds onto contaminants until you clean the filter. When it’s time to clean, simply tapping the filter a few times will remove most of the dirt from the filter pleats. Then spray the filter with AEM’s environmentally friendly, mild, all-purpose cleaner. Rinse the filter with clean water and allow to dry, or blow dry with compressed air. Best of all, the Dryflow filter requires no oiling, so there’s never a chance of over-oiling. The Dryflow filter is extremely durable and will withstand almost unlimited cleanings.

Part Number:
21-681C
UPC:
024844254917
Alternate MPN:
21681C

Reviews

(77)
Only authorized customers can leave a review on our website. We would love to know what you like or dislike about the product. Share your opinion on product quality, appearance, installation, and other characteristics.
/5
1-10 of 77 Reviews
5 of 5
Audi A4
I bought this item for a Audi a4 I love the design I really like the look and most of all the sound that comes out and it adding horsepower to the car overall the installation was very easy and the good thing is. If you're from California it comes with a car sticker so you don't have the problem when doing your smog. If you're thinking of purchasing a cold air intake system this is the way to go I definitely recommend this.
Posted by Oscar (Oxnard, CA) / March 03, 20142008 Audi A4
5 of 5
Adds Power, Sound, & Style
This product is really top in its class as far as fitment, quality, and the instructions are pretty straight forward. I appreciate that it came packaged in the manufacturer's own box and it was neatly organized.
Posted by Christopher (Colorado Springs, CO) / April 14, 20122008 Audi A4
5 of 5
great air intake system
This air intake system was very easy to install in my 2007 Audi A4. It took about 45 min. to install. Looks great and sounds awsome. It add some horse power. Thanks Carid great company.
Posted by Giuseppe (Gloucester, MA) / November 17, 20112007 Audi A4
5 of 5
great cai
Easy to install works great sounds great see some decrease in turbo lag took 1 hour and a few beers to install make sure u r careful installing
Posted by Kristopher (Oceanside, CA) / September 21, 20112008 Audi A4
4 of 5
AEM intake
The item itself works faboulos. it was shipped out fast came with instructions and even emblems and a license plate aem emblem! I am definetly going to buy again from carid. not much to say other than it came to fast and i put it in also the price was very reasonable. thanks
Posted by Roberto (Placerville, CA) / August 11, 20112005 Audi A4
3 of 5
AEM Intake
Put an AEM cold air intake on a 2017 Pilot and it throws a check engine light when it's cold out. Comes and goes.
Posted by Matthew (Stafford Springs, CT) / December 11, 20222017 Honda Pilot
5 of 5
Perfect!
Easy assembly, it looks mean, and beefy.
Posted by Marcel (Clinton, UT) / March 16, 20222017 Chevy Malibu
4 of 5
Super Easy Installation With a Few Draw Backs
The only hard part about installing was getting the ac fuel line disconnected. I was driving down the road and my check engine light came on so I went and got it checked and it said my engine was running lean.
Posted by Bradley (Bullard, TX) / February 13, 20222017 Chevy Malibu
5 of 5
Amazing
Loud as a motherf*cka:) got this bady boy three years ago.
Posted by Customer / January 10, 20222017 Mitsubishi Lancer
5 of 5
Makes My STI Much More Enjoyable To Drive
I was hesitant going with an expensive cold air intake, especially one over $100, as I had only had my car for a few months beforehand. But I can now say, with confidence, if you can afford it, seriously get it. Instillation was 6 steps and took 20 minutes to install. Parts are of good quality, especially their powder-coated red intake. Along with that, with it installed, the turbo can really stretch it's legs, making all the whistling noise to make car guys and girls go mad with enjoyment. I have driven my car 20k miles since the install, and am about to drive across the country, but I seriously can not see myself driving with this much enthusiasm without this intake.
Posted by Customer / August 12, 20212012 Subaru WRX

Questions and Answers

(0)
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