AEM 21-803C Cold Air Intake System

Why Upgrade Your Civic 2.0L with the AEM 21-803C?

Because your K20C2 wants to breathe, and Honda shipped it with a snorkel from a lawn mower.

The 21-803C gives you:

• Improved airflow compared to the restrictive OEM box

• Better throttle response, especially at low and mid-range RPM

• A deeper, far more engaging intake tone

• AEM Dryflow filter – washable, reusable, no oil to ruin your MAF

• A clean, powder-coated aluminum intake tube

• Cooler air routing thanks to optimized placement

On the naturally aspirated 2.0L, every airflow improvement equals more response and a better driving feel.

This AEM 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 Chevrolet Malibu and Volkswagen GTI models.

Key Features of the AEM 21-803C Cold Air Intake

🌀 Mandrel-Bent Aluminum Intake Tube

Smooth interior surface designed to maintain proper sensor readings and stable AFRs.

🧼 AEM Dryflow Filter

• Oil-free

• Reusable

• Excellent filtration

• Designed to maximize flow without sacrificing protection

❄ Cold-Air Positioning

Route pulls in cooler outside air for more consistent performance—even during spirited driving.

🔧 Direct OEM-Compatible Fitment

Air enters the system through an oversized AEM Dry flow synthetic washable air filter for outstanding air flow, filtration and performance.

No cutting. No drilling. No janky zip-tie “engineering.”
AEM made it clean and simple.

🎧 Improved Engine Sound

The K20C2 finally sounds like it cares. Especially around 4,000+ RPM.

The air filter is placed into the original air box space and is protected by a heat shield which is designed to reduce intake air temperature and increase horsepower.

Performance Expectations

On the 2.0L Civic, you can expect:

• Faster tip-in throttle

• Smoother revving

• More responsive acceleration

• A noticeably richer, sportier intake note

• Minor horsepower gains with bigger gains when paired with exhaust/tune

Does it turn the 2.0 into a Type R? No.
Does it make the car feel far less sluggish? Absolutely yes.

The air intake tube is constructed from mandrel-bent aluminum featuring a durable gunmetal gray powder coated finish.

Daily-Driver Friendly

• Works on factory ECU, no tune required

• Does not affect reliability or MPG

• Dryflow filter = low maintenance

• Fits like OEM but performs way better

Perfect upgrade for drivers who want fun without sacrificing comfort or warranty-friendly behavior.

This air intake system was developed to accommodate the engine’s factory emissions control devices including the mass airflow sensor and PCV line.

Installation Overview

Estimated install time: 45–75 minutes

Steps typically include:

1. Remove stock intake and resonator

2. Install heat shield

3. Mount the AEM intake tube

4. Attach Dryflow filter

5. Transfer MAF sensor

6. Tighten clamps and hardware

7. Smile at the new sound your Civic makes

Minimal drama. Maximum satisfaction.

The tapered cylinder shaped AEM Dry flow 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. This air intake cannot be sold in California. It is not legal for use in California or other states adopting California emission standards.