
AEM 21-681C Performance Cold Air Intake System
The AEM 21-681C Performance Cold Air Intake System is designed to boost your Audi A4's horsepower and torque by replacing the restrictive factory air intake components. This system has been meticulously engineered, tuned, and dyno-tested specifically for select Audi A4 models, ensuring a perfect fit and optimal performance.
Key Features
- High-Performance Air Filter: The system includes an oversized AEM Dryflow synthetic washable air filter that provides excellent airflow and filtration. This filter is located in the original air box space and is shielded from heat, helping to maintain cooler intake temperatures for improved power.
- Durable Construction: The intake tubing is crafted from mandrel-bent aluminum with a sleek gunmetal gray powder-coated finish, ensuring both durability and aesthetic appeal.
- Easy Maintenance: The AEM Dryflow air filter is oil-free and can be used for up to 100,000 miles before needing cleaning, depending on driving conditions.
- Emission Compliance: The intake system is designed to accommodate factory emissions control devices, including the mass air flow sensor, making it street legal in all US states.
- Warranty: Enjoy peace of mind with AEM's Limited Lifetime Warranty, backing the quality and performance of your intake system.
Specifications
- Air Filter Color: Red
- Air Filter Height: 5.25 in (133 mm)
- Air Filter Diameter: 6 in (152 mm)
- Air Filter Material: Non-woven Synthetic
- Air Filter Washable: Yes
- Clamp Material: Steel
- Intake Pipe Material: Aluminum
- Weight: 10 lb (4.5 kg)
- CARB EO Number: D-670-15
Fitment Information
The AEM 21-681C is specifically designed to fit select Audi A4 models. For detailed fitment information and to ensure compatibility with your vehicle, please refer to the vehicle applications list.
Customer Feedback
"After installing the AEM 21-681C, I immediately noticed a difference in throttle response. The sound is fantastic, and I can feel the extra power when accelerating!"
"This intake system was a breeze to install. The instructions were clear, and it fits perfectly. I love the look of the gunmetal finish, and it really enhances the engine bay."
"The performance gains are real! I've noticed improved fuel efficiency and a noticeable boost in power. Highly recommend this intake for anyone looking to upgrade their Audi A4!"
Important Notes
From 6/05; California Air Resources Board Exempt: Yes; CARB EO: D-670-15; AEM - Metal Intake System; Gunmetal Gray (CAS)
⚠ WARNING:
Cancer and Reproductive Harm
https://www.P65Warnings.ca.gov
AEM intake offers the very best cold air intake systems on the market, providing drivers with everything they need to get the most out of their vehicle. At Vivid Racing, we are proud to offer our customers AEM cold air intake systems, providing this trusted and reliable brand to all types of drivers.
Whether you are part of a professional race team or just like to push your car to the limit, an AEM intake system is a welcome addition to your vehicle.
What Is an AEM Cold Air Intake System?An AEM cold air intake system is specifically designed to increase the volume of cold air flowing into your engine as you drive. The thinking behind this is that cold air is much denser than warm air. Therefore, if there is more cold air in your engine, there is more air in general, which also means that there is more oxygen. A higher amount of oxygen present in a car engine increases the potency of combustion, which can increase the power and efficiency of your engine.
What Are the Benefits of an AEM Intake System?An AEM intake kit maximizes the amount of power you can get from your engine. This increase in power will also help you conserve fuel and increase your fuel efficiency, saving you money at the gas station. In a sense, an AEM intake system helps your car and engine “breathe†more efficiently, allowing it to reach its full potential.
Why Should I Choose an AEM Intake Kit?AEM is regarded as one of the best aftermarket intake systems on the market, combining quality materials, cutting-edge technology and reliable design to help drivers around the globe improve the power of their engine. All AEM cold air intake systems are engineered to increase your car’s torque and horsepower, and any AEM intake kit comes with a lifetime limited warranty.
Purchase an AEM Cold Air Intake From Vivid Racing TodayTake your driving experience to the next level by purchasing an AEM cold air intake from Vivid Racing. We’ll help you find an AEM intake and air filter that perfectly fits your specific needs. To learn more or to order an AEM intake kit, contact Vivid Racing by calling (480) 966-3040.
Aem One-Year Limited Warranty - This Limited Warranty Gives You Specific Legal Rights And You May Also Have Other Rights, Which Vary From State To State. This Limited Warranty Can Also Be Found Online At Www.Aemintakes.Com/Warranty . We Limit The Duration And Remedies Of All Implied Warranties, Including, Without Limitation, The Warranties Of Merchantability And Fitness For A Particular Purpose To The Duration Of This Express Limited Warranty. Some States Do Not Allow Limitations On How Long An Implied Warranty Lasts. What Does This Warranty Cover? This Warranty Covers Defects In Materials And Workmanship Of Your Aem Universal & Special Air Filter Or Aem Accessory (The "Product"), With The Exceptions Stated Below.
Aem 90-Day Limited Warranty - This Limited Warranty Gives You Specific Legal Rights And You May Also Have Other Rights, Which Vary From State To State. This Limited Warranty Can Also Be Found Online At Www.Aemintakes.Com/Warranty. We Limit The Duration And Remedies Of All Implied Warranties, Including, Without Limitation, The Warranties Of Merchantability And Fitness For A Particular Purpose To The Duration Of This Express Limited Warranty. Some States Do Not Allow Limitations On How Long An Implied Warranty Lasts. What Does This Warranty Cover? This Warranty Covers Defects In Materials And Workmanship Of Your Aem Accessory, Clothing, Promotional Material Or Raw Material (The "Product"), With The Exceptions Stated Below.
What Do These Warranties Not Cover:This Warranty Does Not Cover Damage Due To (A) Transportation, (B) Storage, (C) Improper Use, (D) Failure To Follow The Product Instructions Or To Perform Any Preventive Maintenance, (E) Modifications, (F) Unauthorized Repair, (G) Normal Wear And Tear, (H) Any Type Of Racing Or Competition, (I) Any Off-Road Use Or (J) External Causes Such As Accidents, Abuse, Or Other Actions Or Events Beyond Our Reasonable Control (E.G., Acts Of God And Natural Disasters).
What Will Aem Do? We Will Repair Any Product That Proves To Be Defective In Materials Or Workmanship. If Repair Is Not Possible, We Will Either Replace Your Product With A New Product Of Similar Composition And Price, Or Refund The Full Purchase Price Of Your Product, At Our Sole Discretion. There Is No Charge For Inspection.
How Do I Get Service?If You Are Ever Dissatisfied With The Materials, Workmanship Or Performance Of This Product, Just Give Aem A Call At 1-800-992-3000 And We Will Be Happy To Assist You.
Limitation Of Liability The Remedies Described Above Are Your Sole And Exclusive Remedies And Our Entire Liability For Any Breach Of This Limited Warranty. Our Liability Shall Under No Circumstances Exceed The Actual Amount Paid By You For The Product, Nor Shall We Under Any Circumstances Be Liable For Any Consequential, Incidental, Special Or Punitive Damages Or Losses, Whether Direct Or Indirect.
Installation Instructions
Click to view the Installation Instructions here
Sale price | None |
Wholesale price | $361.53 |
Shipping |
Weight: 9.80 Length: 20 Width: 13 Height: 13 |
Product Added At | Friday 30 March, 2018 |
Product Modified At | Monday 09 June, 2025 |
Imported By | EPICF |
Last Edited By | Turn_API |
View In Admin |
Carb Approved | Yes |
---|---|
Carb Number | D-670-15 |
Epa Status | Compliant |
Prop65 | Yes |
Carb Required | - |
Vendor | Inv | Cost | Retail | Jobber | MAP | Core | Updated | |||
---|---|---|---|---|---|---|---|---|---|---|
Turn 14 | $289.22 | $431.99 | ? | $349.99 | ? | 2025-06-09 10:02:17 |
Check out these other great products
